Numbers 5:17-18

17Then the kohen is to take some holy water in a clay jar and take some dust from the floor of the Tabernacle and put it into the water.

18Then the kohen will have the woman stand before Adonai, loosen the woman’s hair, put into her hands the reminder offering, the offering for jealousy, while in the kohen’s own hands are the bitter waters that bring a curse.