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.

Verse 16. - The eighth ease of incest is intercourse with a brother's wife. Yet this is commanded under certain circumstances in the Book of Deuteronomy, and was practiced in patriarchal times (Genesis 38:8). The following are the circumstances under which it is commanded. "If brethren dwell together, and one of them die, and have no child, the wife of the dead shall not marry without unto a stranger: her husband's brother shall go in unto her, and take her to him to wife, and perform the duty of an husband's brother unto her" (Deuteronomy 25:5). It has been asked, "How can the same thing be forbidden as immoral in Leviticus, and commanded as a duly in Deuteronomy?" Bishop Wordsworth replies, "In a special case, for a special reason applicable only to the Jews, God was pleased to dispense with that law, and in the plenitude of his omnipotence to change the prohibition into a command.... God cannot command anything that is sinful. For sin is 'transgression of the Law' (1 John 3:4), and whatever he commands is right. But it would be presumptuous to say that we may dispense with God's law concerning marriage, because he in one case dispensed with it; as it would be impious to affirm that murder is not immoral, and may be committed by us, bemuse God, who is the sole Arbiter of life and death, commanded Abraham to slay his son Isaac." The levirate marriage was not a concession to the desires of the second brother, but a duty enjoined for a family or tribal purpose, and it was plainly at all times must distasteful. Thus Onan refused to perform his duty to Er's wife (Genesis 38:9); the legislation in Deuteronomy anticipates objection on the part of the brother, and institutes an in-suiting ceremony to be gone through by him if he declines to do his duty to his dead brother (Deuteronomy 25:9, 10), which we see carried out in some of its details in the case of Ruth's kinsman (Ruth 4:7, 10). Indeed, in such a marriage, the second husband seems rather to have been regarded as the continuation of the first husband than as having a substantive existence of his own as a married man. He performed a function in order "that the name of his brother which is dead may not be put out of Israel" (Deuteronomy 25:6), "to raise up the name of the dead upon his inheritance, that the name of the dead be not cut off from among his brethren" (Ruth 3:10). The second husband's position may be compared to that of the concubine presented by Rachel to her husband. "Behold my maid Bilhah, go in unto her; and she shall bear upon my knees, that I may also have children by her" (Genesis 30:3). The whole object of the rule was that, as the elder brother could not keep up the flintily by begetting an heir, the younger brother should do it for him after his death.

Thou shalt not uncover the nakedness of thy brother's wife,.... Neither debauch her nor after the death of the brother marry her, that is, unless he dies without issue; and then, by another law, he was obliged to marry her, Deuteronomy 25:5; hence the Targum of Jonathan adds; by way of explanation."in the life of thy brother, or after his death, if he has children,''but then that law was but an exception from this general rule, and so did not make it void in other respects, but bound it the more strongly; and besides, it was a special and peculiar law to the Jews, until the Messiah came to make it manifest of what tribe and family he came; and the reason of it ceasing, the law itself is ceased, and so neither binding on Jews nor Gentiles: hence John the Baptist boldly told Herod to his face, that it was not lawful for him to have his brother's wife Matthew 14:3; and even such marriages were condemned by the very Heathens: Dionysius Halicarnassensis (n) relates, that Lucius Tarquinius, Superbus, his brother being removed by poison, took Tullia to wife, whom his brother Aruntus had before married; but the historian calls it , "an unholy marriage", and abominable both among Greeks and Barbarians: Plutarch also reports (o), that Marcus Crassus married the wife of his deceased brother; but such marriages are condemned by the same writer, as they are by the ancient Christians in their councils and canons (p); now by this same law, if it is not lawful for a man to have his brother's wife, then it is not lawful for her to have her sister's husband; or, in other words, if it is not lawful for a woman to marry two brothers, then it is not lawful for a man to marry two sisters: the case of Jacob will not countenance such a marriage, since he was imposed upon and deceived; and such marriages have also been disapproved of by the Heathens and Christians: Honorius the emperor married two daughters of Stilico, one after another, but the unhappy exit of both sisters showed that those marriages were not approved of by God, for they both died premature deaths, leaving no children (q):

it is thy brother's nakedness; that is, his wife is, being by marriage one flesh with him, and his brother being so to him, the relation is too near to intermarry, and more especially when there is issue by the first, which connects them strongly.

(n) Hist. l. 4. (o) In Vita M. Crassi. (p) Canon Apostol. can. 19. Concil. Neocaesar. can. 2.((q) Zonaras, l. 3. apud Zanchium de Sponsalibus, l. 4. c. 1. p. 786.

18:16 Thy brother's wife - God afterwards commanded, that in one case, a man should marry his brother's widow.

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