Deuteronomy 27:20

27:20 ‘Cursed is the one who has sexual relations with his father’s former wife, for he dishonors his father.’ Then all the people will say, ‘Amen!’

Deuteronomy 27:23

27:23 ‘Cursed is the one who has sexual relations with his mother-in-law.’ Then all the people will say, ‘Amen!’