Go tell the Watchers of heaven, who have deserted the lofty sky, and their holy everlasting station, who have been polluted with women, and have done as the sons of men do, by taking to themselves wives, and who have been greatly corrupted on the earth; that on the earth they shall never obtain peace and remission of sin. For they shall not rejoice in their offspring; they shall behold the slaughter of their beloved; shall lament for the destruction of their sons; and shall petition for ever; but shall not obtain mercy and peace.
The Book of Enoch 12:5-7