Leviticus 18:13

''Do not have sexual relations with your mother's sister, because she is your mother's close relative.

(New International Version)

'You shall not uncover the nakedness of your mother's sister, for she is your mother's blood relative.

(New American Standard Bible)

Thou shalt not uncover the nakedness of thy mother's sister: for she is thy mother's near kinswoman.

(King James Version)