Leviticus 20:19

New American Bible - revised edition

You shall not have intercourse with your mother’s sister or your father’s sister, because that dishonors one’s own flesh; they shall bear their penalty.

Cross References

Exodus 6:20

Amram married his aunt Jochebed, who bore him Aaron, Moses, and Miriam. Amram lived one hundred and thirty-seven years.

Leviticus 18:6

None of you shall approach a close relative to have sexual intercourse. I am the Lord.