From Pesikto Rabbati, 25, 2:
The adulterer strives to conceal his crime. What does God do?
He fashions the child of sin in the likeness of the adulterer.
R. Isaac said: “In theft, one party gains, and the other loses. In adultery, both parties gain pleasure. Who loses? The Creator. He is compelled to become a party in their crime, and to create their child together with the.”
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