Numbers 5:19-22

19and the priest shall cause her to swear, and shall say unto the woman, If no man have lain with thee, and if thou hast not gone aside to uncleanness, being under thy husband, be thou free from this water of bitterness that causeth the curse:

20but if thou hast gone aside, being under thy husband, and if thou be defiled, and some man have lain with thee besides thine husband:

21then the priest shall cause the woman to swear with the oath of cursing, and the priest shall say unto the woman, The LORD make thee a curse and an oath among thy people, when the LORD doth make thy thigh to fall away, and thy belly to swell;

22and this water that causeth the curse shall go into thy bowels, and make thy belly to swell, and thy thigh to fall away: and the woman shall say, Amen, Amen.