Leviticus 18:15

15 "'You must not have sexual relations with your daughter-in-law; she is your son's wife. Do not 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; she is your mother's close relative.

14 You must not have sexual relations with the wife of your father's brother, because this would shame him. She is your aunt.

15 "'You must not have sexual relations with your daughter-in-law; she is your son's wife. Do not 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. And do not have sexual relations with this woman's granddaughter, either the daughter of her son or her daughter; they are her close relatives. It is evil to do this.