3. Mose (Wajikra) 18:14

ערות אחי אביך לא תגלה THE NAKEDNESS OF THY FATHER'S BROTHER THOU SHALT NOT UNCOVER — and what does this "uncovering of his nakedness" mean אל אשתו לא תקרב? THOU SHALT NOT APPROACH TO HIS WIFE.

עֶרְוַ֥ת אֲחִֽי־אָבִ֖יךָ לֹ֣א תְגַלֵּ֑ה אֶל־אִשְׁתּוֹ֙ לֹ֣א תִקְרָ֔ב דֹּדָֽתְךָ֖ הִֽוא׃ {ס}        

Thou shalt not uncover the nakedness of thy father’s brother, thou shalt not approach to his wife: she is thy aunt.