Carl Friedrich Keil and Franz Delitzsch Old Testament Commentary

The next day the rebels presented themselves with censers before the tabernacle, along with Moses and Aaron; and the whole congregation also assembled there at the instigation of Korah. The Lord then interposed in judgment. Appearing in His glory to the whole congregation (just as in Num 14:10), He said to Moses and Aaron, "Separate yourselves from this congregation; I will destroy them in a moment." By assembling in front of the tabernacle, the whole congregation had made common cause with the rebels. God threatened them, therefore, with sudden destruction. But the two men of God, who ere so despised by the rebellious faction, fell on their faces, interceding with God, and praying, "God, Thou God of the spirits of all flesh! this one man (i.e., Korah, the author of the conspiracy) hath sinned, and wilt Thou be wrathful with all the congregation?" i.e., let Thine anger fall upon the whole congregation. The Creator and Preserver of all beings, who has given and still gives life and breath to all flesh, is God of the spirits of all flesh. As the author of the spirit of life in all perishable flesh, God cannot destroy His own creatures in wrath; this would be opposed to His own paternal love and mercy. In this epithet, as applied to God, therefore, Moses appeals "to the universal blessing of creation. It is of little consequence whether these words are to be understood as relating to all the animal kingdom, or to the human race alone; because Moses simply prayed, that as God was the creator and architect of the world, He would not destroy the men whom He had created, but rather have mercy upon the works of His own hands" (Calvin). The intercession of the prophet Isaiah, in Isa 64:8, is similar to this, though that is founded upon the special relation in which God stood to Israel.