Numbers 5:17-18

17He must take some holy water in a clay jar and pour into it dust he has taken from the Tabernacle floor.

18When the priest has presented the woman before the Lord, he must unbind her hair and place in her hands the offering of proof—the jealousy offering to determine whether her husband’s suspicions are justified. The priest will stand before her, holding the jar of bitter water that brings a curse to those who are guilty.