Numbers 5:17-21

and the priest shall take holy water in an earthen vessel; and of the dust that is on the floor of the tabernacle the priest shall take, and put it into the water. And the priest shall set the woman before Jehovah, and let the hair of the woman’s head go loose, and put the meal-offering of memorial in her hands, which is the meal-offering of jealousy: and the priest shall have in his hand the water of bitterness that causeth the curse. And the priest shall cause her to swear, and shall say unto the woman, If no man have lain with thee, and if thou have not gone aside to uncleanness, being under thy husband, be thou free from this water of bitterness that causeth the curse. But if thou have gone aside, being under thy husband, and if thou be defiled, and some man have lain with thee besides thy husband: then the priest shall cause the woman to swear with the oath of cursing, and the priest shall say unto the woman, Jehovah make thee a curse and an oath among thy people, when Jehovah doth make thy thigh to fall away, and thy body to swell