Numbers 5:19-20

19The priest will then put the woman under oath and say to her, ‘If no other man has had sex with you, and you have not gone astray and defiled yourself while under your husband’s authority, may you be immune from the effects of this bitter water that brings on the curse.

20But if you have gone astray by being unfaithful to your husband, and have defiled yourself by having sex with another man—’