The danger of corrupting true religion.
God has from the beginning been solicitous for the purity of his revelation and worship. He would never suffer his ordinances to be tampered with, or share his honour with other gods. "Thou shalt worship the Lord thy God, and him only shalt thou serve" (Deuteronomy 6:13; Luke 4:8).
I. IT HAS BEEN GUARDED BY AWFUL SANCTIONS. Frequently in Old Testament history the death penalty was inflicted upon spiritual pretenders, false prophets, and idolatrous worshippers of Jehovah. The warning of the text is very significant; a time was to come when no Jew would any more swear by Jehovah in Egypt, for the very good reason that there would be none there. "In the form of asseveration the Name of Jehovah would be still retained, although they had long since been devoted to the service of other gods. But Jehovah, who is a jealous God, rejects honour and acknowledgment which he must share with others; and so his Name shall no longer be heard from the mouth of any Jews in Egypt" (Hitzig). In the New Testament men are warned of making the Word of God "a cloke for lasciviousness;" of "perishing in the gainsaying of Core;" of tasting of the powers of the world to come, and falling back; of making gain of godliness; of handling the Word of God deceitfully, and wresting it to their own destruction; or of adding aught to the revealed truth (Revelation 22:18, Revelation 22:19).
II. REASONS FOR THIS SEVERITY,
1. Objective.
2. Subjective.