Numbers 5:18-19

Then the priest shall stand the woman before the LORD, uncover the woman’s head, and put the offering for remembering in her hands, which is the grain offering of jealousy. And the priest shall have in his hand the bitter water that brings a curse. And the priest shall put her under oath, and say to the woman, “If no man has lain with you, and if you have not gone astray to uncleanness while under your husband’s authority, be free from this bitter water that brings a curse.