Num Numbers, chapter Book of Numbers, chapter 5

And the spirit of jealousy come upon him, and he be jealous of his wife, and she be defiled: or if the spirit of jealousy come upon him, and he be jealous of his wife, and she be not defiled:

Then shall the man bring his wife unto the priest, and he shall bring her offering for her, the tenth [part] of an eifah 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.Exo 16:36