then the man is to bring his wife to the priest. He is to bring her approach offering for her: the tenth part of an ephah of barley flour. He is to pour no oil on it, nor put frankincense on it, for it is a grain offering of jealousy, a grain offering of remembrance, bringing iniquity to memory. Bible see other translations

“no oil.” This approach offering was not to have oil or frankincense because it was a bitter occasion when a man suspected his wife of adultery. There was not to be anything mixed with the offering that made it have a sweet smell.

Commentary for: Numbers 5:15