Leviticus 18:15

15 You must not have sexual relations with your daughter-in-law. She is your son’s wife; you are not to have sexual relations 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 relations with your mother’s sister, for she is your mother’s close relative.

14 You must not dishonor your father’s brother by approaching his wife to have sexual relations with her; she is your aunt.

15 You must not have sexual relations with your daughter-in-law. She is your son’s wife; you are not to have sexual relations with her.

16 You must not have sexual relations with your brother’s wife; that would shame your brother.

17 You must not have sexual relations with both a woman and her daughter. You are not to marry her son’s daughter or her daughter’s daughter and have sexual relations with her. They are close relatives; it is depraved.