Numbers 5:19-20

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’—