12-15. if any man's wife go aside, and commit a trespass against him--This law was given both as a strong discouragement to conjugal infidelity on the part of a wife, and a sufficient protection of her from the consequences of a hasty and groundless suspicion on the part of the husband. His suspicions, however, were sufficient in the absence of witnesses (Le 20:10) to warrant the trial described; and the course of proceeding to be followed was for the jealous husband to bring his wife unto the priest with an offering of barley meal, because none were allowed to approach the sanctuary empty handed (Ex 23:15). On other occasions, there were mingled with the offering, oil which signified joy, and frankincense which denoted acceptance (Ps 141:2). But on the occasion referred to, both these ingredients were to be excluded, partly because it was a solemn appeal to God in distressing circumstances, and partly because it was a sin offering on the part of the wife, who came before God in the character of a real or suspected offender.

JFB.