Leviticus 20:19

You shall not uncover the nakedness of your mother’s sister or of your father’s sister , for that is to make naked one’s relative ; they shall bear their iniquity .

“‘Do not have sexual relations with the sister of either your mother or your father, for that would dishonor a close relative; both of you would be held responsible.

And thou shalt not uncover the nakedness of thy mother's sister, nor of thy father's sister : for he uncovereth his near kin : they shall bear their iniquity.