15 then he is to take his wife to the priest. He must also take an offering of a tenth of an ephaha of barley flour on her behalf. He must not pour olive oil on it or put incense on it, because it is a grain offering for jealousy, a reminder-offering to draw attention to wrongdoing.

Read Numbers 5:15 Using Other Translations

Then shall the man bring his wife unto the priest, and he shall bring her offering for her, the tenth part of an ephah of barley meal; he shall pour no oil upon it, nor put frankincense thereon; for it is an offering of jealousy, an offering of memorial, bringing iniquity to remembrance.
then the man shall bring his wife to the priest and bring the offering required of her, a tenth of an ephah of barley flour. He 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, bringing iniquity to remembrance.
the 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.