Leviticus 20:17

20:17 “‘If a man has sexual intercourse with his sister, whether the daughter of his father or his mother, so that he sees her nakedness and she sees his nakedness, it is a disgrace. They must be cut off in the sight of the children of their people. He has exposed his sister’s nakedness; he will bear his punishment for iniquity.

Deuteronomy 27:22

27:22 ‘Cursed is the one who has sexual relations with his sister, the daughter of either his father or mother.’ Then all the people will say, ‘Amen!’

Deuteronomy 27:2

27:2 When you cross the Jordan River to the land the Lord your God is giving you, you must erect great stones and cover them with plaster.

Deuteronomy 13:11-14

13:11 Thus all Israel will hear and be afraid; no longer will they continue to do evil like this among you.

Punishment of Community Idolatry

13:12 Suppose you should hear in one of your cities, which the Lord your God is giving you as a place to live, that 13:13 some evil people have departed from among you to entice the inhabitants of their cities, saying, “Let’s go and serve other gods” (whom you have not known before). 13:14 You must investigate thoroughly and inquire carefully. If it is indeed true that such a disgraceful thing is being done among you,

Ezekiel 22:11

22:11 One commits an abominable act with his neighbor’s wife; another obscenely defiles his daughter-in-law; another violates his sister – his father’s daughter – within you.