‘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!’

then his sister-in-law must approach him in view of the elders, remove his sandal from his foot, and spit in his face. ¹  She will then respond, “Thus may it be done to any man who does not maintain his brother’s family line!” ²