Leviticus 18:15

15 You must not expose your daughter-in-law's nakedness; she [is] your son's wife; you must not expose her nakedness.

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 expose the nakedness of your mother's sister, because she [is] {your mother's close relative}.

14 You must not expose the nakedness of your father's brother; you must not {have sex with} his wife--she [is] your aunt.

15 You must not expose your daughter-in-law's nakedness; she [is] your son's wife; you must not expose her nakedness.

16 You must not expose the nakedness of your brother's wife; she [is] your brother's nakedness.

17 You must not expose the nakedness of a woman and her daughter, or her son's daughter, or her daughter's daughter; you must not take [her as wife] to expose her nakedness; they [are] {close relatives}--that [is] wickedness.