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

Chapter XXVIII.—Spiritual Adultery.

“Wherefore, it is fitting to hear the one only Prophet of the truth, knowing that the word that is sown by another bearing the charge of fornication, is, as it were, cast out by the Bridegroom from His kingdom.  But to those who know the mystery, death is also produced by spiritual adultery.  For whenever the soul is sown by others, then it is forsaken by the Spirit, as guilty of fornication or adultery; and so the living body, the life-giving Spirit being withdrawn, is dissolved into dust, and the rightful punishment of sin is suffered at the time of the judgment by the soul, after the dissolution of the body; even as, among men, she who is caught in adultery is first cast out from the house, and then afterwards is condemned to punishment.”