Leviticus 18:15

15 You are not to have sexual relations with your daughter-in-law; because 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 are not to have sexual relations with your mother's sister, because she is your mother's close relative.

14 You are not to disgrace your father's brother by having sexual relations with his wife, because she is your aunt.

15 You are not to have sexual relations with your daughter-in-law; because she is your son's wife. Do not have sexual relations with her.

16 You are not to have sexual relations with your brother's wife, because this is your brother's prerogative.

17 "'You are not to have sexual relations with both a woman and her daughter, nor are you to have sexual relations with her son's daughter or her daughter's daughter; they are close relatives of hers, and it would be shameful.