Numbers 5:23-28

And the priest shall write these curses in a book, and he shall blot them out into the water of bitterness: and he shall make the woman drink the water of bitterness that causeth the curse; and the water that causeth the curse shall enter into her and become bitter. And the priest shall take the meal-offering of jealousy out of the woman’s hand, and shall wave the meal-offering before Jehovah, and bring it unto the altar: and the priest shall take a handful of the meal-offering, as the memorial thereof, and burn it upon the altar, and afterward shall make the woman drink the water. And when he hath made her drink the water, then it shall come to pass, if she be defiled, and have committed a trespass against her husband, that the water that causeth the curse shall enter into her and become bitter, and her body shall swell, and her thigh shall fall away: and the woman shall be a curse among her people. And if the woman be not defiled, but be clean; then she shall be free, and shall conceive seed.