These are the angels who descended to the earth, and revealed what was hidden to the children of men. The brief identification stitches the Parables back to the Book of Watchers — chapters 6-16’s long narrative is summarized in a single sentence. The crime is named exactly: not the descent itself, not even the intermarriage, but the revealing of what was hidden. Forbidden knowledge is the durable Enochic verdict on the Watchers’ fall. Tertullian’s De Cultu Feminarum (On the Apparel of Women) takes this exact phrase as warrant for treating cosmetics, metallurgy, and astronomy as fallen disciplines — a position later Christianity had to qualify, but which has its source here.