Numbers 5:17-18

17and the priest shall take holy water [from the sacred basin] in an earthenware vessel; and he shall take some of the dust that is on the floor of the tabernacle and put it in the water.

18The priest shall then have the woman stand before the Lord, and let the hair of the woman’s head hang loose, and put the memorial grain offering in her hands, which is the jealousy offering, and in the hand of the priest is to be the water of bitterness that brings a curse.