So you shall appoint Aaron and his sons to carry out the duties of the priesthood; but any outsider who approaches the tabernacle must be put to death.”
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
And thou shalt appoint Aaron and his sons,.... To the priestly office; this was done before, but is renewed for the confirmation of it, and repeated to put them in mind of it, that they be careful to execute it, as follows: and they shall wait on their priest's office, to do what was peculiar to it, both in the holy and in the most...
And thou shalt appoint Aaron and his sons, and they shall wait on their priest's office: and the stranger that cometh nigh shall be put to death. (g) Any that would minister not being a Levite.