Numbers 1:53

But the Levites shall pitch round about the tabernacle of testimony,.... Between the tabernacle and the camps of Israel, to guard the tabernacle and preserve the things in it, and to keep persons from going into it that should not, to pollute or plunder it: these were placed in like manner as the four living creatures round the throne, Revelation 4:6; where the allusion seems to be to this situation of the Levites:

that there be no wrath upon the congregation of the children of Israel; that is, from the Lord, should any of them approach too near, or meddle with and touch what they had nothing to do with, or go where they should not; such wrath as came upon Uzzah for his error and transgression before observed:

and the Levites shall keep the charge of the tabernacle of testimony; the several things in it committed to their charge; see Numbers 3:8.