Numbers 5:15

15then the man shall bring his wife to the priest and bring the offering required of her, a tenth of an ephah
An  ephah was about 3/5 bushel or 22 liters
of barley flour. bHe shall pour no oil on it and put no frankincense on it, for it is a grain offering of jealousy, a grain offering of remembrance, cbringing iniquity to remembrance.

Numbers 5:25-26

25And the priest shall take the grain offering of jealousy out of the woman’s hand dand shall wave the grain offering before the Lord and bring it to the altar. 26And the priest eshall take a handful of the grain offering, as its memorial portion, and burn it on the altar, and afterward shall make the woman drink the water.
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