Numbers 5:19-22

19Then the kohen will have her swear under oath, then say to the woman, ‘If no man other than your husband has slept with you, and if you have not gone astray into impurity from your husband, may this bitter water that brings a curse not harm you.

20If, however, you have gone astray from your husband and if you became impure and had sexual relations with a man other than your husband’—

21Then the kohen is to have the woman swear under this oath of a curse, and say to the woman—‘then let Adonai cause you to be cursed and denounced among your people when Adonai causes your thigh to rot and your belly to swell.

22“May this water which brings a curse enter your body and cause your belly to swell and your thigh to rot.’ “The woman is to say, ‘Amen, amen!’