2 Peter 2:4 KJV — For if God spared not the angels that sinned, but cast them down to hell, and delivered them into chains of darkness, to be reserved unto judgment;
Jude 1:6 KJV — And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.
The concept of angels being bound in chains appears in the Book of Enoch:
with them in all their uncleanness. And when their sons have slain one another, and they have seen the destruction of their beloved ones, bind them fast for seventy generations in the valleys of the earth, till the day of their judgement and of their consummation, till the judgement that is
13 for ever and ever is consummated… — Enoch 10:12-13
I understand that the older and less adulterated Aramaic text is different from the Ethiopic one, but in regards to this fragment, they seem tk correspond.
Does the concept of fallen angels being chained until the Final Judgement in the New Testament come from the Book of Enoch, or does the idea have its source in the Old Testament? If it does come from the book of Enoch, then how does this affect the idea of the divine origin of the Bible?