Origen, on Exod 20:5

“Thou shalt not adore them, nor serve them: I am the Lord thy God, mighty, jealous, visiting the iniquity of the fathers upon the children, unto the third and fourth generation of them that hate me:”

“When men try to seduce us to apostasy, it is useful to reflect upon what God wishes to teach us when he says, "I am the Lord your God, jealous." In my view, just as the bridegroom who wishes to make his bride live chastely so as to give herself entirely to him and beware of any relationship whatever with any man other than her husband, pretends, though he be wise, to be jealous—he uses this pretense as a kind of antidote for his bride—so the Lawgiver, especially when he reveals himself as "the firstborn of every creature," says to his bride, the soul, that he is a jealous God. In this way he keeps his followers from any fornication with demons and pretended gods.”

Imported from an open dataset — not yet checked against the printed edition.