This is the law of jealousies - And this is the most singular law in the whole Pentateuch: a law that seems to have been copied by almost all the nations of the earth, whether civilized or barbarian, as we find that similar modes of trial for suspected offenses were used when complete evidence was wanting to convict; and where it was expected that the object of their worship would interfere for the sake of justice, in order that the guilty should be brought to punishment, and the innocent be cleared. For general information on this head see at the end of this chapter. (See Numbers 5:31 (note)).

This is the law of jealousies,.... Which was appointed by God to deter wives from adultery, and preserve the people of Israel, the worshippers of him, from having a spurious brood among them; and to keep husbands from being cruel to their wives they might be jealous of, and to protect virtue and innocence, and to detect lewdness committed in the most secret manner; whereby God gave proof of his omniscience, that he had knowledge of the most private acts of uncleanness, and was the avenger of all such. The reasons why such a law was not made equally in favour of women, as of men, are supposed to be these: because of the greater authority of the man over the woman, which would seem to be lessened, if such a power was granted her; because marriage was not so much hurt, or so much damage came to families by the adultery of men, as of women; because women are more apt to be suspicious than men, and in those times more prone to adultery, through their eager desire of children, that they might not lie under reproach (o):
when a wife goeth aside to another instead of her husband, and is defiled; is suspected of going aside to another man, and is supposed to be defiled by him.
(o) Vid. Salden. ut supra, (Otia, l. 1. Exercitat. 6.) sect. 19.

This is the law of jealousies--Adultery discovered and proved was punished with death. But strongly suspected cases would occur, and this law made provision for the conviction of the guilty person. It was, however, not a trial conducted according to the forms of judicial process, but an ordeal through which a suspected adulteress was made to go--the ceremony being of that terrifying nature, that, on the known principles of human nature, guilt or innocence could not fail to appear. From the earliest times, the jealousy of Eastern people has established ordeals for the detection and punishment of suspected unchastity in wives. The practice was deep-rooted as well as universal. And it has been thought, that the Israelites being strongly biassed in favor of such usages, this law of jealousies "was incorporated among the other institutions of the Mosaic economy, in order to free it from the idolatrous rites which the heathens had blended with it." Viewed in this light, its sanction by divine authority in a corrected and improved form exhibits a proof at once of the wisdom and condescension of God.