Numbers 5:15

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 (f) oil upon it, nor put frankincense thereon; for it [is] an offering of jealousy, an offering of memorial, bringing iniquity to (g) remembrance.

(f) Only in the sin offering, and so this offering of jealousy were neither oil nor incense offered.

(g) Or, making the sin known, and not purging it.