1 Enoch 12:3
1 Before these things, Enoch was hidden, and no one among the children of men knew where he was hidden, where he lived, or what had happened to him. 2 His dealings were with the Watchers, and he spent his days among the holy ones. 3 And I, Enoch, was praising the Lord of majesty and the King of the ages, and lo! the Watchers called me - Enoch the scribe - and said to me: 4 'Enoch, you scribe of righteousness, go, tell the Watchers of heaven who have left the high heaven, the holy eternal place, and have defiled themselves with women, and have acted as the children of earth do, and have taken wives for themselves: You have caused great destruction on the earth:
Irenaeus Against Heresies 4.16
2 And that man was not justified by these things, but that they were given as a sign to the people, this fact shows — that Abraham himself, without circumcision and without observance of Sabbaths, believed God, and it was imputed unto him for righteousness; and he was called the friend of God. Then, again, Lot, without circumcision, was brought out from Sodom, receiving salvation from God. So also did Noah, pleasing God, although he was uncircumcised, receive the dimensions [of the ark], of the world of the second race [of men]. Enoch, too, pleasing God, without circumcision, discharged the office of God's legate to the angels although he was a man, and was translated, and is preserved until now as a witness of the just judgment of God, because the angels when they had transgressed fell to the earth for judgment, but the man who pleased [God] was translated for salvation. Moreover, all the rest of the multitude of those righteous men who lived before Abraham, and of those patriarchs who preceded Moses, were justified independently of the things above mentioned, and without the law of Moses. As also Moses himself says to the people in Deuteronomy: The Lord your God formed a covenant in Horeb. The Lord formed not this covenant with your fathers, but for you. 3 Why, then, did the Lord not form the covenant for the fathers? Because the law was not established for righteous men. But the righteous fathers had the meaning of the Decalogue written in their hearts and souls, that is, they loved the God who made them, and did no injury to their neighbour. There was therefore no occasion that they should be cautioned by prohibitory mandates (correptoriis literis), because they had the righteousness of the law in themselves. But when this righteousness and love to God had passed into oblivion, and became extinct in Egypt, God did necessarily, because of His great goodwill to men, reveal Himself by a voice, and led the people with power out of Egypt, in order that man might again become the disciple and follower of God; and He afflicted those who were disobedient, that they should not contemn their Creator; and He fed them with manna, that they might receive food for their souls (uti rationalem acciperent escam); as also Moses says in Deuteronomy: And fed you with manna, which your fathers did not know, that you might know that man does not live by bread alone; but by every word of God proceeding out of His mouth does man live. And it enjoined love to God, and taught just dealing towards our neighbour, that we should neither be unjust nor unworthy of God, who prepares man for His friendship through the medium of the Decalogue, and likewise for agreement with his neighbour — matters which did certainly profit man himself; God, however, standing in no need of anything from man. 4 And therefore does the Scripture say, These words the Lord spoke to all the assembly of the children of Israel in the mount, and He added no more; for, as I have already observed, He stood in need of nothing from them. And again Moses says: And now Israel, what does the Lord your God require of you, but to fear the Lord your God, to walk in all His ways, and to love Him, and to serve the Lord your God with all your heart, and with all your soul? Now these things did indeed make man glorious, by supplying what was wanting to him, namely, the friendship of God; but they profited God nothing, for God did not at all stand in need of man's love. For the glory of God was wanting to man, which he could obtain in no other way than by serving God. And therefore Moses says to them again: Choose life, that you may live, and your seed, to love the Lord your God, to hear His voice, to cleave unto Him; for this is your life, and the length of your days. Preparing man for this life, the Lord Himself did speak in His own person to all alike the words of the Decalogue; and therefore, in like manner, do they remain permanently with us, receiving by means of His advent in the flesh, extension and increase, but not abrogation.
Notes and References
"... Irenaeus exhibits his familiarity with the angel story in several passages of his Against Heresies. The following were cited above in the first part of the chapter: 1.10.1; 1.15.6; 4.16.2; and 4.36.4. He also mentions it in In Demonstration of the Apostolic Preaching 18 ..."
VanderKam, James C. The Jewish Apocalyptic Heritage in Early Christianity (p. 66) Fortress Press, 1993