Deuteronomy 27:23

Blessings And Curses

²² ‘Cursed is he who lies with his sister, the daughter of his father or of his mother.’ And all the people shall say, ‘Amen.’ ²³ ‘Cursed is he who lies with his mother-in-law.’ And all the people shall say, ‘Amen.’ ²⁴ ‘Cursed is he who strikes his neighbor in secret.’ And all the people shall say, ‘Amen.’

Sexual Relations

Leviticus 20:14

If there is a man who marries a woman and her mother, it is immorality; both he and they shall be burned with fire, so that there will be no immorality in your midst.

Leviticus 18:17

You shall not uncover the nakedness of a woman and of her daughter, nor shall you take her son’s daughter or her daughter’s daughter, to uncover her nakedness; they are blood relatives. It is lewdness.