Numbers 5:23-28

‘The priest shall then write these curses on a scroll, and he shall wash them off into the water of bitterness. Then he shall make the woman drink the water of bitterness that brings a curse, so that the water which brings a curse will go into her and cause bitterness. The priest shall take the grain offering of jealousy from the woman’s hand, and he shall wave the grain offering before the LORD and bring it to the altar; and the priest shall take a handful of the grain offering as its memorial offering and offer it up in smoke on the altar, and afterward he shall make the woman drink the water. When he has made her drink the water, then it shall come about, if she has defiled herself and has been unfaithful to her husband, that the water which brings a curse will go into her and cause bitterness, and her abdomen will swell and her thigh will waste away, and the woman will become a curse among her people. But if the woman has not defiled herself and is clean, she will then be free and conceive children.