TSK · Leviticus 18:9

You must not have sexual relations with the daughter of your father’s wife born of your father; she is your sister. You must not have sexual relations with her.

‘Cursed is the one who goes to bed with his sister, the daughter of either his father or mother.’ Then all the people will say,‘Amen!’

But she said to him,“No, my brother! Don’t humiliate me! This just isn’t done in Israel! Don’t do this foolish thing!