Jubilees 4:15

And in the second week of the tenth jubilee [449-55 A.M.] Mahalalel took unto him to wife DinaH, the daughter of Barakiel the daughter of his father's brother, and she bare him a son in the third week in the sixth year, [461 A.M.] and he called his name Jared, for in his days the angels of the Lord descended on the earth, those who are named the Watchers, that they should instruct the children of men, and that they should do judgment and uprightness on the earth.