Book 1 6:1
The children of Seth were warned not to descend into the corrupt way of Qayin. For a season they remained apart, remembering the command of their fathers. But music, feasting, lust, and the beauty of the daughters below became a snare to many.
Book 1 6:2
They broke their oath, descended from the holy place, and mingled with the lawlessness they had been commanded to avoid. In this way the boundary of discipline collapsed, and violence increased upon the earth.