“And stand it before Aaron, the priest, and they shall serve him” – they shall serve him in his service and he will appoint treasurers and overseers from among them. “They shall serve him” – in their regard the verse says: “My eyes are on the faithful of the land; they will dwell with Me. He who walks in the path of integrity, it is he who will serve Me…” (Psalms 101:6). “They shall keep his commission.… They shall safeguard all the vessels of the Tent of Meeting…” (Numbers 3:7–8) – they would encamp around the Tent of Meeting, and they would carry its vessels and load them.
“You shall give the Levites to Aaron…” (Numbers 3:9) – is it perhaps that they shall serve him in his service, that they should perform his labor? The verse states: “I have hereby taken [the Levites]…and the Levites [shall be] Mine” (Numbers 3:12). “Given for the Lord” (Numbers 18:6) – they are given for the Lord to the priests, and not to perform his labor, as they were gatekeepers and singers, and safeguarded all the vessels of the Tent of Meeting, carrying them, and loading them.
“You shall count Aaron and his sons, [and they shall observe their priesthood]” (Numbers 3:10) – just as the Levites were commanded, so, the priests were commanded regarding their service, and all of them by Moses. “The commoner who approaches shall be put to death” (Numbers 3:10) – this is the punishment.