Leviticus 18:14-16

¹⁴Thou shalt not show the filthhood of the brother of thy father, neither thou shalt nigh to his wife, that is joined to thee by affinity.

¹⁵Thou shalt not show the filthhood of thy son’s wife, for she is the wife of thy son, neither thou shalt discover her shame; and no man take his brother’s wife.

¹⁶Thou shalt not show the filth-hood of thy brother’s wife, for it is the filthhood of thy brother.