Leviticus 20:19

19 Never have sexual intercourse with your mother's sister or your father's sister. Whoever has sexual intercourse with a close relative must be punished.

Leviticus 20:19 Meaning and Commentary

Leviticus 20:19

And thou shalt not uncover the nakedness of thy mother's
sister, nor of thy father's sister
An aunt either by mother or father's side, against which the law is, ( Leviticus 18:13 ) ; for he uncovereth his near kin;
as an aunt is to a man, and so an uncle to a woman, and both equally criminal; for it is a rule that holds good in all those cases, though not expressed, that what is binding upon one sex is upon the other, being in the same degree of relation, whether of consanguinity or affinity: they shall bear their iniquity;
"both" of them, as the Vulgate Latin version, the man and his aunt, and so a woman and her uncle; the guilt of their sin shall be upon them,
and the punishment of it be inflicted on them; either they should be cut off from their people, as before, or be childless, as in the following instances.

Leviticus 20:19 In-Context

17 Whoever takes his sister, his father's daughter or his mother's daughter, and has sexual intercourse does a shameful thing. They both must be publicly excluded from the people. He has had sexual intercourse with his sister and must be punished.

18 If a man has sexual intercourse with a woman while she has her monthly period, both of them have had sexual intercourse in blood. They must be excluded from the people.

19 Never have sexual intercourse with your mother's sister or your father's sister. Whoever has sexual intercourse with a close relative must be punished.

20 Whoever has sexual intercourse with his uncle's wife violates his uncle's marriage. That man and woman are guilty of sin. They will die without children.

21 Whoever marries his brother's wife violates his brother's marriage and does an unclean thing. That man and woman will have no children.