Moses
Numbers 3:7ESV·traditional attribution

They shall keep guard over him and over the whole congregation before the tent of meeting, as they minister at the tabernacle.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. The family of Aaron is confirmed in the priests' office, Num 3:10. They had been called to it before, and consecrated; here they are appointed to wait on their priests' office: the apostle uses this phrase (Rom 12:7), Let us wait on our ministry.

Commenting on Numbers 3:1-13

John Gill Reformed Baptist @doctorgill

And they shall keep his charge, and the charge of the whole congregation,.... The charge of Aaron and of all the people of Israel, which was to secure the sanctuary from being polluted or plundered: this the Levites were to be employed about, and thereby ease the high priest and the other priests, and the people, of what otherwise would have been incumbent on them...

Geneva Bible Notes Reformed @genevanotes

And they shall keep his charge, and the charge of the whole congregation before the tabernacle of the congregation, to do the service of the tabernacle. (e) Which belonged to the executing of the high priests commandment, to the oversight of the people, and the service of the tabernacle.