עֶרְוַ֥ת אֲחִֽי־אָבִ֖יךָ לֹ֣א תְגַלֵּ֑ה אֶל־אִשְׁתּוֹ֙ לֹ֣א תִקְרָ֔ב דֹּדָֽתְךָ֖ הִֽוא׃ (ס)
Targum Jonathan on Leviticus
The nakedness of thy father's brother thou shalt not dishonour, nor come nigh to his wife carnally; she is the wife of thy father's brother.