Leviticus 18:14

The English Standar Version

You shall not uncover the nakedness of your father's brother, that is, you shall not approach his wife; she is your aunt.

See the chapter Copy

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

If a man lies with his uncle's wife, he has uncovered his uncle's nakedness; they shall bear their sin; they shall die childless.