Numbers 5:15

15 He must then take his wife to the priest along with eight cups of barley flour as an offering for her. He must not pour olive oil on the flour or put frankincense on it, since it is a grain offering brought because of the husband's jealousy, an offering used for a confession--to remind someone of a sin that was committed.

Numbers 5:15 In-Context

13 and may have had sexual intercourse with another man without her husband's knowledge. She may have kept it secret if there were no witnesses to accuse her and she wasn't caught in the act.
14 "A husband may have a fit of jealousy and suspect his wife, whether she was actually unfaithful or not.
15 He must then take his wife to the priest along with eight cups of barley flour as an offering for her. He must not pour olive oil on the flour or put frankincense on it, since it is a grain offering brought because of the husband's jealousy, an offering used for a confession--to remind someone of a sin that was committed.
16 "The priest will have the woman come forward and stand in the LORD's presence.
17 Then the priest will take holy water in a piece of pottery and put some dust from the floor of the tent into the water.
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