From the Dead Sea Scrolls:

TESTAMENT OF REUBEN

> “For they changed themselves unto the shape of men” –Testament of Reuben

Therefore flee fornication, my children, and command your wives and your daughters that they adorn not their heads and their faces; because every woman who acteth deceitfully in these things hath been reserved to everlasting punishment. For thus they allured the Watchers before the flood; and as these continually beheld them, they fell into desire each of the other, and they conceived the act in their mind, and changed themselves into the shape of men, and appeared to them in their congress with their husbands;

THE TESTAMENT OF AMRAN

 “I saw watchers in my vision. I asked them, you, what are you? They answered and said ‘We have been made masters, and rule over the sons of men.’  I raised my eyes and saw one of them, his looks were frightening, like those of a viper” –Testament of Amram

Nuf Said