Deuteronomy 22:30

Now the sons of Jacob came in from the field when they heard it; and the men were grieved, and they were very angry because he had done a disgraceful thing in Israel by lying with Jacob’s daughter, for such a thing ought not to be done.

‘You shall not uncover the nakedness of your father’s wife; it is your father’s nakedness.

‘Cursed is he who lies with his father’s wife because he has uncovered his father’s skirt.’ And all the people shall say, ‘Amen.’

It is actually reported that there is sexual immorality among you, and sexual immorality of such a kind as does not exist even among the Gentiles, that someone has his father’s wife.