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 oil upon it, nor put frankincense thereon; for it is an offering of jealousy, an offering of memorial, bringing iniquity to remembrance. This passage is included at this point of the legislation because it concerned the preserving of the nation's purity as the army of Jehovah. The husband's suspicion, whether justified or not, endangered the life of the family, and whether the man, in a fit of anger, was inclined to repudiate his wife, although she was innocent, or whether he, in case she was guilty, winked at her transgression and continued to live with her, although he regarded her as a common harlot, the danger to the nation's morals was the same.