Numbers 5:11-15

11And the Lord said to Moses,

12“Give the following instructions to the people of Israel. “Suppose a man’s wife goes astray, and she is unfaithful to her husband

13and has sex with another man, but neither her husband nor anyone else knows about it. She has defiled herself, even though there was no witness and she was not caught in the act.

14If her husband becomes jealous and is suspicious of his wife and needs to know whether or not she has defiled herself,

15the husband must bring his wife to the priest. He must also bring an offering of two quarts of barley flour to be presented on her behalf. Do not mix it with olive oil or frankincense, for it is a jealousy offering—an offering to prove whether or not she is guilty.