Numbers 5:17-18

17The priest shall take holy water in an earthen vessel, and take some of the dust that is on the floor of the tabernacle and put it into the water.

18Then 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.