Matthew Poole and continuators on Exodus 30:30

30 And thou shalt anoint Aaron and his sons , and consecrate them, that they may minister unto me in the priests office.

Not all of them, but onely those who succeed him in the High-Priests Office, as appears from Exod. 40. 15. Levit. 4. 3, 5, 16. and 16. 32. and 21. 10. This anointing of them signified both Gods election or calling them to this office, and the inward qualifications requisite for it, to wit, the gifts and graces of the Holy Ghost, which are oft designed by this word of anointing, as Isa. 61. 1. Dan. 9. 24. 1. Iohn 2. 27. and the solemn setting a part of Christ, the true High-Priest, for the mediatorial office.