Numbers 5:20-21

20But if thou have gone aside, being under thy husband, and if thou be defiled, and some man have lain with thee besides thy husband: 21then 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;