Numbers 5:24-26
24 He shall have the woman drink the bitter water that brings a curse, and this water will enter her and cause bitter suffering.
25 The priest is to take from her hands the grain offering for jealousy, wave it before the Lord and bring it to the altar.
26 The priest is then to take a handful of the grain offering as a memorial offering and burn it on the altar; after that, he is to have the woman drink the water.