Leviticus 20:19
You must not have sexual relations with the sister of your mother or your father, for it is exposing one’s own kin; both shall bear their iniquity.
Berean Standard Bible
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.
“‘You shall not uncover the nakedness of your mother’s sister, nor of your father’s sister, for he has made his close relative naked. They shall bear their iniquity.