Leviticus 20:19-21

191You shall also not uncover the nakedness of your mother’s sister or of your father’s sister, for such a one has uncovered his 2blood relative; they will bear their guilt. 203If there is a man who sleeps with his uncle’s wife, he has uncovered his uncle’s nakedness; they will bear their sin. They will die childless. 214If there is a man who takes his brother’s wife, it is 5detestable; he has uncovered his brother’s nakedness. They will be childless.