The Third Commandment: Oath-Taking

Jim ButlerMatthew 5:33–37

Jesus' instruction in Matthew 5:33–37 is not a universal prohibition against oath-taking but a condemnation of the Pharisaic practice of swearing by created things — heaven, earth, Jerusalem, one's own head — as a device to lend apparent solemnity to speech while evading accountability to God. The sermon exposes this abuse by tracing the Old Testament's positive teaching on oaths, demonstrating from Christ's own submission to adjuration in Matthew 26 and from Paul's sworn affirmations that lawful oath-taking remains valid. The corrective Jesus offers is the kingdom ethic of simple truthfulness: the citizen of Christ's kingdom needs no oath to be believed, because his yes is yes and his no is no, and any compulsion to pad speech beyond this reveals the depraved bent traced ultimately to the father of lies. The Sermon on the Mount, rightly understood, drives the hearer to the cross, where Christ — who honored every commandment and swore to his own hurt — provides the righteousness no oath-keeper can supply for himself.