Thou shall not uncover the nakedness of a woman and her daughter,.... That is, if a man marries a woman, and she has a daughter, which is the man's daughter-in-law, after the death of his wife he may not marry this daughter; for this daughter is of the same flesh with her mother, who became one flesh with the man she married, and therefore his relation to her daughter is too near to marry her: Jarchi says, if he does not marry the woman, but only deflower her, it is free for him to marry her daughter; but Aben Ezra says, if he has lain with the mother, the daughter is forbidden; however, if he married either of them, the other was forbidden; he could not marry them both, neither in the lifetime of them both, nor after the death of either of them:

neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; not any of her granddaughters, either in the line of her son or daughter; that is, might not lie with either of them, or marry them, and much less then marry her own daughter, these being a further remove from her:

for they are her near kinswomen; one or other of them, even every one of them, "the rest" and residue "of her" (r), of her flesh, who together made one flesh with her; and therefore not to be married to her husband, either in her life, or after her death:

it is wickedness: a very great wickedness, abominable in the sight of God, and to be detested by man as vile and impious; it is whoredom, as the Targum of Jonathan renders it.

(r) "reliquiae sunt ipsae", Tigurine version.

Marriage with a woman and her daughter, whether both together or in succession, is described in Deuteronomy 27:20 as an accursed lying with the mother-in-law; whereas here it is the relation to the step-daughter which is primarily referred to, as we may see from the parallel prohibition, which is added, against taking the daughter of her son or daughter, i.e., the granddaughter-in-law. Both of these were crimes against blood-relationship which were to be punished with death in the case of both parties (Leviticus 20:14), because they were "wickedness," זמּה, lit., invention, design, here applied to the crime of licentiousness and whoredom (Leviticus 19:29; Judges 20:6; Job 31:11).

Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness.

18:1-30 Unlawful marriages and fleshly lusts. - Here is a law against all conformity to the corrupt usages of the heathen. Also laws against incest, against brutal lusts, and barbarous idolatries; and the enforcement of these laws from the ruin of the Canaanites. God here gives moral precepts. Close and constant adherence to God's ordinances is the most effectual preservative from gross sin. The grace of God only will secure us; that grace is to be expected only in the use of the means of grace. Nor does He ever leave any to their hearts' lusts, till they have left him and his services.