Numbers 5:17

“And the priest shall take holy water, etc.] Out of the laver, as the Targums of Onkelos and Jonathan, and so Jarchi and Aben Ezra: in an earthen vessel; which held half a log, and that was but a quarter of a pint, or three egg shells; for no more was assigned, to a suspected woman, according to the Misnah f38. Some say only a fourth part: an earthen vessel was made use of, as everything vile and mean was in this affair: and of the dust that is in the floor of the tabernacle the priest shall take, and put [it] into the water; first the water was put in, and then the dust, as Ben Gersom observes: there was a place a cubit square, where was a marble table, and a ring fixed in it, and when he…”

“the priest shall take holy water--Water from the laver, which was to be mixed with dust--an emblem of vileness and misery (Gen 3:14; Psa 22:15). in an earthen vessel--This fragile ware was chosen because, after being used, it was broken in pieces (Lev 6:28; Lev 11:33). All the circumstances of this awful ceremony--her being placed with her face toward the ark--her uncovered head, a sign of her being deprived of the protection of her husband (Co1 11:7) --the bitter potion being put into her hands preparatory to an appeal to God--the solemn adjuration of the priest (Num 5:19-22), all were calculated in no common degree to excite and appall the imagination of a person conscious of guilt.”

“The trial of jealousy. Since the crime of adultery is especially defiling and destructive of the very foundations of social order, the whole subject is dealt with at a length proportionate to its importance. The process prescribed has lately been strikingly illustrated from an Egyptian “romance,” which refers to the time of Rameses the Great, and may therefore well serve to illustrate the manners and customs of the Mosaic times. This mode of trial, like several other ordinances, was adopted by Moses from existing and probably very ancient and widely spread institutions. Numbers 5:15 The offering was to be of the cheapest and coarsest kind, barley (compare 2 Kings 7:1, 2 Kings 7:16, 2 Kings…”

“Holy water - Water of purification appointed for such uses. This was used, that if she were guilty, she might be afraid to add profaneness to her other crime. An earthen vessel - Because, after this use, it was to be broken in pieces, that the remembrance of it might be blotted out as far as was possible. Dust - An emblem of vileness and misery. From the floor of the tabernacle - Which made it holy dust, and struck the greater terror into the woman, if she were guilty. Numbers 5:18”

“5:17 The holy water and the dust were sacred because of their association with the sanctuary.”

“holy water: That is, water from the laver; called holy, because separated from common to sacred uses. This is the most ancient account of the trial by ordeal, which obtained so generally among various nations; and it was calculated to fortify the minds of the Israelitish women in the hour of temptation, and to render them watchful against all occasions of exciting suspicion in the breasts of their husbands. Num 19:2-9; Exo 30:18 of the dust: Job 2:12; Jer 17:13; Lam 3:29; Joh 8:6, Joh 8:8 Numbers 5:18”