19 The priest shall cause her to swear, and shall tell the woman, “If no man has lain with you, and if you haven’t gone aside to uncleanness, being under your husband, be free from this water of bitterness that brings a curse. 20 But if you have gone astray, being under your husband, and if you are defiled, and some man has lain with you besides your husband:” 21 then the priest shall cause the woman to swear with the oath of cursing, and the priest shall tell the woman, “Yahweh make you a curse and an oath among your people, when Yahweh allows your thigh to fall away, and your body to swell; 22 and this water that brings a curse will go into your bowels, and make your body swell, and your thigh fall away.” The woman shall say, “Amen, Amen.”
Matthew Henry's Commentary on Numbers 5:19-22
Commentary on Numbers 5:11-31
(Read Numbers 5:11-31)
This law would make the women of Israel watch against giving cause for suspicion. On the other hand, it would hinder the cruel treatment such suspicions might occasion. It would also hinder the guilty from escaping, and the innocent from coming under just suspicion. When no proof could be brought, the wife was called on to make this solemn appeal to a heart-searching God. No woman, if she were guilty, could say "Amen" to the adjuration, and drink the water after it, unless she disbelieved the truth of God, or defied his justice. The water is called the bitter water, because it caused the curse. Thus sin is called an evil and a bitter thing. Let all that meddle with forbidden pleasures, know that they will be bitterness in the latter end. From the whole learn, 1. Secret sins are known to God, and sometimes are strangely brought to light in this life; and that there is a day coming when God will, by Christ, judge the secrets of men according to the gospel, Romans 2:16. 2 In particular, Whoremongers and adulterers God will surely judge. Though we have not now the waters of jealousy, yet we have God's word, which ought to be as great a terror. Sensual lusts will end in bitterness. 3. God will manifest the innocency of the innocent. The same providence is for good to some, and for hurt to others. And it will answer the purposes which God intends.