Numbers 5:18-20

18And the priest shall set the woman before Jehovah, and uncover the woman's head, and put the memorial oblation in her hands, which is the jealousy offering; and in the hand of the priest shall be the bitter water that bringeth the curse.

19And the priest shall adjure her, and say unto the woman, If no man have lain with thee, and if thou hast not gone astray in uncleanness, in being with another instead of thy husband, be free from this bitter water that bringeth the curse.

20But if thou hast gone astray to another instead of thy husband, and hast been defiled, and a man other than thy husband have lain with thee,