Numbers 5:19-22

19Then the priest shall have her take an oath and say to the woman, “If no man has lain with you and if you have not gone astray into uncleanness [while married], then be immune to this water of bitterness that brings a curse;

20but if you have gone astray [while married] and you have defiled yourself and a man other than your husband has been intimate with you”

21(then the priest shall have the woman swear the oath of the curse, and say to the woman), “The Lord make you a curse and an oath among your people when the Lord makes your thigh waste away and your abdomen swell;

22and this water that brings a curse shall go into your stomach, and make your abdomen swell and your thigh waste away.” And the woman shall say, “Amen. Amen (so let it be).”