There is only one reference to the Messianic Son of Man in the Old Testament and that is:
Daniel 7:13-14 (NIV)
"In my vision at night I looked, and there before me was one like a son of man, coming with the clouds of heaven. He approached the Ancient of Days and was led into his presence. He was given authority, glory and sovereign power; all peoples, nations and men of every language worshiped him. His dominion is an everlasting dominion that will not pass away, and his kingdom is one that will never be destroyed.
Others may say this passage may also refers to him:
Psalm 8:4-6 (NIV)
what is man that you are mindful of him,
the son of man that you care for him?
You made him a little lower than the heavenly beings [a]
and crowned him with glory and honor.
You made him ruler over the works of your hands;
you put everything under his feet:
Though I think this is referring to people, not him. In 1 Enoch however, there is a wealth of information about him. I've copied all the references to the Son of Man (also called the Elect One and the Anointed one) in 1 Enoch. It would make the post too long and lessen the impact of these writings if I gave the New Testament equivalents, but I did put significant parallels in bold.
CHAPTER XXXIX: 4,5,6a,7a,6b
And there I saw another vision, the dwelling-places of the holy,
And the resting-places of the righteous.
Here mine eyes saw their dwellings with His righteous angels,
And their resting-places with the holy.
And in that place mine eyes saw the Elect One of righteousness and of faith,
And I saw his dwelling-place under the wings of the Lord of Spirits.
And righteousness shall prevail in his days,
And the righteous and elect shall be without number before Him for ever and ever.
CHAPTER XLV: 1-6
And this is the Second Parable concerning those who deny the name of the dwelling of the holy ones and the Lord of Spirits.
And into the heaven they shall not ascend,
And on the earth they shall not come:
Such shall be the lot of the sinners
Who have denied the name of the Lord of Spirits,
Who are thus preserved for the day of suffering and tribulation.
On that day Mine Elect One shall sit on the throne of glory
And shall try their works,
And their places of rest shall be innumerable.
And their souls shall grow strong within them when they see Mine Elect Ones,
And those who have called upon My glorious name:
Then will I cause Mine Elect One to dwell among them.
And I will transform the heaven and make it an eternal blessing and light
And I will transform the earth and make it a blessing:
And I will cause Mine elect ones to dwell upon it:
But the sinners and evil-doers shall not set foot thereon.
For I have provided and satisfied with peace My righteous ones
And have caused them to dwell before Me:
But for the sinners there is judgement impending with Me,
So that I shall destroy them from the face of the earth.
CHAPTER XLVI: 1-8
And there I saw One who had a head of days,
And His head was white like wool,
And with Him was another being whose countenance had the appearance of a man,
And his face was full of graciousness, like one of the holy angels.
And I asked the angel who went with me and showed me all the hidden things, concerning that Son of Man, who he was, and whence he was, (and)
why he went with the Head of Days? And he answered and said unto me:
This is the son of Man who hath righteousness,
With whom dwelleth righteousness,
And who revealeth all the treasures of that which is hidden,
Because the Lord of Spirits hath chosen him,
And whose lot hath the pre-eminence before the Lord of Spirits in uprightness for ever.
And this Son of Man whom thou hast seen
Shall †raise up† the kings and the mighty from their seats,
[And the strong from their thrones]
And shall loosen the reins of the strong,
And break the teeth of the sinners.
[And he shall put down the kings from their thrones and kingdoms]
Because they do not extol and praise Him,
Nor humbly acknowledge whence the kingdom was bestowed upon them.
And he shall put down the countenance of the strong,
And shall fill them with shame.
And darkness shall be their dwelling,
And worms shall be their bed,
And they shall have no hope of rising from their beds,
Because they do not extol the name of the Lord of Spirits.
And these are they who †judge† the stars of heaven,
[And raise their hands against the Most High],
†And tread upon the earth and dwell upon it†.
And all their deeds manifest unrighteousness,
And their power rests upon their riches,
And their faith is in the †gods† which they have made with their hands,
And they deny the name of the Lord of Spirits,
And they persecute the houses of His congregations,
And the faithful who hang upon the name of the Lord of Spirits.
CHAPTER XLVIII: 1-10
And in that place I saw the fountain of righteousness
Which was inexhaustible:
And around it were many fountains of wisdom;
And all the thirsty drank of them,
And were filled with wisdom,
And their dwellings were with the righteous and holy and elect.
And at that hour that Son of Man was named In the presence of the Lord of Spirits,
And his name before the Head of Days.
Yea, before the sun and the signs were created,
Before the stars of the heaven were made,
His name was named before the Lord of Spirits.
He shall be a staff to the righteous whereon to stay themselves and not fall,
And he shall be the light of the Gentiles,
And the hope of those who are troubled of heart.
All who dwell on earth shall fall down and worship before him,
And will praise and bless and celebrate with song the Lord of Spirits.
And for this reason hath he been chosen and hidden before Him,
Before the creation of the world and for evermore.
And the wisdom of the Lord of Spirits hath revealed him to the holy and righteous;
For he hath preserved the lot of the righteous,
Because they have hated and despised this world of unrighteousness,
And have hated all its works and ways in the name of the Lord of Spirits:
For in his name they are saved,
And according to his good pleasure hath it been in regard to their life.
In these days downcast in countenance shall the kings of the earth have become,
And the strong who possess the land because of the works of their hands;
For on the day of their anguish and affliction they shall not (be able to) save themselves.
And I will give them over into the hands of Mine elect:
As straw in the fire so shall they burn before the face of the holy:
As lead in the water shall they sink before the face of the righteous,
And no trace of them shall any more be found.
And on the day of their affliction there shall be rest on the earth,
And before them they shall fall and not rise again:
And there shall be no one to take them with his hands and raise them:
For they have denied the Lord of Spirits and His Anointed.
The name of the Lord of Spirits be blessed.
CHAPTER XLIX: 1-4
For wisdom is poured out like water,
And glory faileth not before him for evermore.
For he is mighty in all the secrets of righteousness,
And unrighteousness shall disappear as a shadow,
And have no continuance;
Because the Elect One standeth before the Lord of Spirits,
And his glory is for ever and ever,
And his might unto all generations.
And in him dwells the spirit of wisdom,
And the spirit which gives insight,
And the spirit of understanding and of might,
And the spirit of those who have fallen asleep in righteousness.
And he shall judge the secret things,
And none shall be able to utter a lying word before him;
For he is the Elect One before the Lord of Spirits according to His good pleasure.
CHAPTER LI: 1, 5a, 3-4, 5b-d
And in those days shall the earth also give back that which has been entrusted to it,
And Sheol also shall give back that which it has received,
And hell shall give back that which it owes.
For in those days the Elect One shall arise,
And he shall choose the righteous and holy from among them:
For the day has drawn nigh that they should be saved.
And the Elect One shall in those days sit on My throne,
And his mouth shall pour forth all the secrets of wisdom and counsel:
For the Lord of Spirits hath given (them) to him and hath glorified him.
And in those days shall the mountains leap like rams,
And the hills also shall skip like lambs satisfied with milk,
And the faces of ⌈all⌉ the angels in heaven shall be lighted up with joy.
And the earth shall rejoice,
And the righteous shall dwell upon it,
And the elect shall walk thereon.
CHAPTER LII: 3-9
And I asked the angel who went with me, saying, 'What things are these which I have seen in secret?' And he said unto me: 'All these things which thou hast seen shall serve the dominion of His Anointed that he may be potent and mighty on the earth.'
And that angel of peace answered, saying unto me: 'Wait a little, and there shall be revealed unto thee all the secret things which surround the Lord of Spirits.
And these mountains which thine eyes have seen,
The mountain of iron, and the mountain of copper, and the mountain of silver,
And the mountain of gold, and the mountain of soft metal, and the mountain of lead,
All these shall be in the presence of the Elect One
As wax: before the fire,
And like the water which streams down from above [upon those mountains],
And they shall become powerless before his feet.
And it shall come to pass in those days that none shall be saved,
Either by gold or by silver,
And none be able to escape.
And there shall be no iron for war,
Nor shall one clothe oneself with a breastplate.
Bronze shall be of no service,
And tin [shall be of no service and] shall not be esteemed,
And lead shall not be desired.
And all these things shall be [denied and] destroyed from the surface of the earth,
When the Elect One shall appear before the face of the Lord of Spirits.'
CHAPTER LIII: 1-7
There mine eyes saw a deep valley with open mouths, and all who dwell on the earth and sea and islands shall bring to him gifts and presents and tokens of homage, but that deep valley shall not become full.
And their hands commit lawless deeds,
And the sinners devour all whom they lawlessly oppress:
Yet the sinners shall be destroyed before the face of the Lord of Spirits,
And they shall be banished from off the face of His earth,
And they shall perish for ever and ever.
For I saw all the angels of punishment abiding (there) and preparing all the instruments of Satan. And I asked the angel of peace who went with me: 'For whom are they preparing these instruments?' And he said unto me: 'They prepare these for the kings and the mighty of this earth, that they may thereby be destroyed.
And after this the Righteous and Elect One shall cause the house of his congregation to appear: henceforth they shall be no more hindered in the name of the Lord of Spirits.
And these mountains shall not stand as the earth before his righteousness,
But the hills shall be as a fountain of water,
And the righteous shall have rest from the oppression of sinners.'
When I have desired to take hold of them by the hand of the angels on the day of tribulation and pain because of this, I will cause My chastisement and My wrath to abide upon them, saith God, the Lord of Spirits. Ye †mighty kings† who dwell on the earth, ye shall have to behold Mine Elect One, how he sits on the throne of glory and judges Azâzêl, and all his associates, and all his hosts in the name of the Lord of Spirits.'
And I saw in those days how long cords were given to those angels, and they took to themselves wings and flew, and they went towards the north.
And I asked the angel, saying unto him: 'Why have those (angels) taken these cords and gone off?' And he said unto me: 'They have gone to measure.'
And the angel who went with me said unto me:
'These shall bring the measures of the righteous,
And the ropes of the righteous to the righteous,
That they may stay themselves on the name of the Lord of Spirits for ever and ever.
The elect shall begin to dwell with the elect,
And those are the measures which shall be given to faith
And which shall strengthen righteousness.
And these measures shall reveal all the secrets of the depths of the earth,
And those who have been destroyed by the desert,
And those who have been devoured by the beasts,
And those who have been devoured by the fish of the sea,
That they may return and stay themselves
On the day of the Elect One;
For none shall be destroyed before the Lord of Spirits,
And none can be destroyed.
And all who dwell above in the heaven received a command and power and one voice and one light like unto fire.
And that One (with) their first words they blessed,
And extolled and lauded with wisdom,
And they were wise in utterance and in the spirit of life.
And the Lord of Spirits placed the Elect one on the throne of glory.
And he shall judge all the works of the holy above in the heaven,
And in the balance shall their deeds be weighed
And when he shall lift up his countenance
To judge their secret ways according to the word of the name of the Lord of Spirits,
And their path according to the way of the righteous judgement of the Lord of Spirits,
Then shall they all with one voice speak and bless,
And glorify and extol and sanctify the name of the Lord of Spirits.
And He will summon all the host of the heavens, and all the holy ones above, and the host of God, the Cherubic, Seraphin and Ophannin, and all the angels of power, and all the angels of principalities, and the Elect One, and the other powers on the earth (and) over the water. On that day shall raise one voice, and bless and glorify and exalt in the spirit of faith, and in the spirit of wisdom, and in the spirit of patience, and in the spirit of mercy, and in the spirit of judgement and of peace, and in the spirit of goodness, and shall all say with one voice: "Blessed is He, and may the name of the Lord of Spirits be blessed for ever and ever."
All who sleep not above in heaven shall bless Him:
All the holy ones who are in heaven shall bless Him,
And all the elect who dwell in the garden of life:
And every spirit of light who is able to bless, and glorify, and extol, and hallow Thy blessed name,
And all flesh shall beyond measure glorify and bless Thy name for ever and ever.
For great is the mercy of the Lord of Spirits, and He is long-suffering,
And all His works and all that He has created He has revealed to the righteous and elect
In the name of the Lord of Spirits.
And thus the Lord commanded the kings and the mighty and the exalted, and those who dwell on the earth, and said: 'Open your eyes and lift up your horns if ye are able to recognize the Elect One.'
And the Lord of Spirits seated him on the throne of His glory,
And the spirit of righteousness was poured out upon him,
And the word of his mouth slays all the sinners,
And all the unrighteous are destroyed from before his face.
And there shall stand up in that day all the kings and the mighty,
And the exalted and those who hold the earth,
And they shall see and recognize How he sits on the throne of his glory,
And righteousness is judged before him,
And no lying word is spoken before him.
Then shall pain come upon them as on a woman in travail,
[And she has pain in bringing forth]
When her child enters the mouth of the womb,
And she has pain in bringing forth.
And one portion of them shall look on the other,
And they shall be terrified,
And they shall be downcast of countenance,
And pain shall seize them,
When they see that Son of Man Sitting on the throne of his glory.
And the kings and the mighty and all who possess the earth shall bless and glorify and extol him who rules over all, who was hidden.
For from the beginning the Son of Man was hidden,
And the Most High preserved him in the presence of His might,
And revealed him to the elect.
And the congregation of the elect and holy shall be sown,
And all the elect shall stand before him on that day.
And all the kings and the mighty and the exalted and those who rule the earth
Shall fall down before him on their faces,
And worship and set their hope upon that Son of Man,
And petition him and supplicate for mercy at his hands.
Nevertheless that Lord of Spirits will so press them
That they shall hastily go forth from His presence,
And their faces shall be filled with shame,
And the darkness grow deeper on their faces.
And He will deliver them to the angels for punishment,
To execute vengeance on them because they have oppressed His children and His elect
And they shall be a spectacle for the righteous and for His elect:
They shall rejoice over them,
Because the wrath of the Lord of Spirits resteth upon them,
And His sword is drunk with their blood.
And the righteous and elect shall be saved on that day,
And they shall never thenceforward see the face of the sinners and unrighteous.
And the Lord of Spirits will abide over them,
And with that Son of Man shall they eat
And lie down and rise up for ever and ever.
And the righteous and elect shall have risen from the earth,
And ceased to be of downcast countenance.
And they shall have been clothed with garments of glory,
And these shall be the garments of life from the Lord of Spirits:
And your garments shall not grow old,
Nor your glory pass away before the Lord of Spirits.
In those days shall the mighty and the kings who possess the earth implore (Him) to grant them a little respite from His angels of punishment to whom they were delivered, that they might fall down and worship before the Lord of Spirits, and confess their sins before Him. And they shall bless and glorify the Lord of Spirits, and say:
'Blessed is the Lord of Spirits and the Lord of kings,
And the Lord of the mighty and the Lord of the rich,
And the Lord of glory and the Lord of wisdom,
And splendid in every secret thing is Thy power from generation to generation,
And Thy glory for ever and ever:
Deep are all Thy secrets and innumerable,
And Thy righteousness is beyond reckoning.
We have now learnt that we should glorify
And bless the Lord of kings and Him who is king over all kings.'
And they shall say:
'Would that we had rest to glorify and give thanks
And confess our faith before His glory!
And now we long for a little rest but find it not:
We follow hard upon and obtain (it) not:
And light has vanished from before us,
And darkness is our dwelling-place for ever and ever:
For we have not believed before Him
Nor glorified the name of the Lord of Spirits, [nor glorified our Lord]
But our hope was in the sceptre of our kingdom,
And in our glory.
And in the day of our suffering and tribulation He saves us not,
And we find no respite for confession
That our Lord is true in all His works, and in His judgements and His justice,
And His judgements have no respect of persons.
And we pass away from before His face on account of our works,
And all our sins are reckoned up in righteousness.'
Now they shall say unto themselves: 'Our souls are full of unrighteous gain, but it does not prevent us from descending from the midst thereof into the †burden† of Sheol.'
And after that their faces shall be filled with darkness
And shame before that Son of Man,
And they shall be driven from his presence,
And the sword shall abide before his face in their midst.
Thus spake the Lord of Spirits: 'This is the ordinance and judgement with respect to the mighty and the kings and the exalted and those who possess the earth before the Lord of Spirits.'
CHAPTER LXX: 1-2
And it came to pass after this that his name during his lifetime was raised aloft to that Son of Man and to the Lord of Spirits from amongst those who dwell on the earth. And he was raised aloft on the chariots of the spirit and his name vanished among them.
CHAPTER LXXI: 11-17
And I fell on my face,
And my whole body became relaxed,
And my spirit was transfigured;
And I cried with a loud voice,
. . .with the spirit of power,
And blessed and glorified and extolled.
And these blessings which went forth out of my mouth were well pleasing before that Head of Days.
And that Head of Days came with Michael and Gabriel, Raphael and Phanuel, thousands and ten thousands of angels without number.
[Lost passage wherein the Son of Man was described as accompanying the Head of Days, and Enoch asked one of the angels (as in 463) concerning the Son of Man as to who he was.]
And he (i.e. the angel) came to me and greeted me with His voice, and said unto me:
'This is the Son of Man who is born unto righteousness;
And righteousness abides over him,
And the righteousness of the Head of Days forsakes him not.'
And he said unto me:
'He proclaims unto thee peace in the name of the world to come;
For from hence has proceeded peace since the creation of the world,
And so shall it be unto thee for ever and for ever and ever.
And all shall walk in his ways since righteousness never forsaketh him:
With him will be their dwelling-places, and with him their heritage,
And they shall not be separated from him for ever and ever and ever.
And so there shall be length of days with that Son of Man,
And the righteous shall have peace and an upright way
In the name of the Lord of Spirits for ever and ever.'
1 Enoch quotes are from www.sacred-texts.com. To get to a particular chapter, add 3 to the one you want. ie To get to Chapter 11, go to http://www.sacred-texts.com/bib/boe/boe014.htm.
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taken from http://www.biblegateway.com
The Importance of 1 Enoch to Christianity.