Ante-Nicene Fathers, Vol VIII:
Pseudo-Clementine Literature.: Chapter XVIII

Chapter XVIII.—The Law to the Survivors.

“Since, therefore, the souls of the deceased giants were greater than human souls, inasmuch as they also excelled their bodies, they, as being a new race, were called also by a new name.  And to those who survived in the world a law was prescribed of God through an angel, how they should live.  For being bastards in race, of the fire of angels and the blood of women, and therefore liable to desire a certain race of their own, they were anticipated by a certain righteous law.  For a certain angel was sent to them by God, declaring to them His will, and saying:—