Leviticus 18:15

15 Or with your daughter-in-law, for she is your son's wife, and you may not take 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 may not have sex connection with your mother's sister, for she is your mother's near relation.

14 You may not have sex relations with the wife of your father's brother, for she is of your family;

15 Or with your daughter-in-law, for she is your son's wife, and you may not take her.

16 You may not have sex relations with your brother's wife, for she is your brother's.

17 You may not take as wife a woman and her daughter, or her son's daughter or her daughter's daughter, for they are of one family: it is an act of shame.