Leviticus 18:15

15 You must not have sexual contact with your daughter-in-law; she is your son's wife. You must not have sexual contact with her.

Leviticus 18:15 Meaning and Commentary

Leviticus 18:15

Thou shall not uncover the nakedness of thy daughter in law,
&c.] Shall not he with her in his son's lifetime, or marry her after his death: she [is] that son's wife;
and so one flesh with him, and who is of the same flesh and blood with his father, and therefore the nearness of the relation forbids such incestuous copulation or marriage: thou shall not uncover her nakedness;
or have carnal knowledge of her, whether in the life or after the death of his son, even then marriage with her is not lawful.

Leviticus 18:15 In-Context

13 You must not have sexual contact with your mother's sister because she is your mother's blood relative.

14 You will not uncover the nakedness of your father's brother—that is, you will not approach his wife for sex; she is your aunt.

15 You must not have sexual contact with your daughter-in-law; she is your son's wife. You must not have sexual contact with her.

16 You will not uncover the nakedness of your brother's wife; it is your brother's nakedness.

17 You must not have sexual contact with a woman and her daughter. You will not marry her son's daughter or her daughter's daughter, thereby uncovering her nakedness. They are her blood relatives; it is shameful.