Numbers 5:18-19

5:18 Then the priest will have the woman stand before the Lord, uncover the woman’s head, and put the grain offering for remembering in her hands, which is the grain offering of suspicion. The priest will hold in his hand the bitter water that brings a curse. 5:19 Then the priest will put the woman under oath and say to the her, “If no other man has had sexual relations with you, and if you have not gone astray and become defiled while under your husband’s authority, may you be free from this bitter water that brings a curse.

Numbers 5:23-24

5:23 “‘Then the priest will write these curses on a scroll and then scrape them off into the bitter water. 5:24 He will make the woman drink the bitter water that brings a curse, and the water that brings a curse will enter her to produce bitterness.

Numbers 5:27

5:27 When he has made her drink the water, then, if she has defiled herself and behaved unfaithfully toward her husband, the water that brings a curse will enter her to produce bitterness – her abdomen will swell, her thigh will fall away, and the woman will become a curse among her people.