Moses
Numbers 4:20ESV·traditional attribution

but they shall not go in to look on the holy things even for a moment, lest they die.”

Matthew Henry Presbyterian @wholebiblehenry

We have here a second muster of the tribe of Levi. As that tribe was taken out of all Israel to be God's peculiar, so the middle-aged men of that tribe were taken from among the rest to be actually employed in the service of the tabernacle. Now observe, I. Who were to be taken into this number. All the males from thirty years old to fifty.

Commenting on Numbers 4:1-20

John Gill Reformed Baptist @doctorgill

Take also the sum of the sons of Gershon,.... As well as of the sons of Kohath; for though Gershon was Levi's eldest son, yet his posterity were not excused from the service of the tabernacle, and bearing things of it in journeying: throughout the houses of their fathers, by their families; all in their several houses, and in the several families in those houses...

Keil & Delitzsch Lutheran @keilanddelitzsch

Num 4:20 כּבלּע, “like a swallow, a gulp,” is probably a proverbial expression, according to the analogy of Job 7:19, for “a single instant,” of which the Arabic also furnishes examples (see A. Schultens on Job 7:19). The Sept. rendering, ἐξάπινα, conveys the actual sense. A historical illustration of Num 4:20 is furnished by 1Sa 6:19.