Leviticus 18:15

15 Thou shalt not show the filthhood of thy son's wife, for she is the wife of thy son, neither thou shalt discover her shame; and no man take his brother's wife. (Thou shalt not uncover the nakedness of thy son's wife, for she is thy son's wife, so thou shalt not uncover her nakedness; and no man shall take his brother's wife to bed.)

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 Thou shalt not show the filthhood of the sister of thy mother, for she is the flesh of thy mother. (Thou shalt not uncover the nakedness of thy mother's sister, for she is of thy mother's flesh.)

14 Thou shalt not show the filthhood of the brother of thy father, neither thou shalt nigh to his wife, that is joined to thee by affinity. (Thou shalt not uncover the nakedness of thy father's brother, that is, thou shalt not come near to his wife, for she is joined to thee by affinity.)

15 Thou shalt not show the filthhood of thy son's wife, for she is the wife of thy son, neither thou shalt discover her shame; and no man take his brother's wife. (Thou shalt not uncover the nakedness of thy son's wife, for she is thy son's wife, so thou shalt not uncover her nakedness; and no man shall take his brother's wife to bed.)

16 Thou shalt not show the filth(hood) of thy brother's wife, for it is the filthhood of thy brother. (Thou shalt not uncover the nakedness of thy brother's wife, for her nakedness is for thy brother alone.)

17 Thou shalt not show the filth(hood) of a woman, and of her daughter; thou shalt not take the daughter of her son, and the daughter of her daughter, that thou show her shame; they be the flesh of her, and such lechery is incest, that is, lechery of them that be kin. (Thou shalt not uncover the nakedness of both a woman, and her daughter; thou shalt not take her son's daughter, or her daughter's daughter, and uncover their nakedness; for they be of her flesh, and such lechery is incest, that is, lechery of them who be kin.)