i.e. A sign or seal that their priesthood shall continue as long as their polity lasts, till the coming of Messias. He signifies that this unction should be sufficient for all succeeding priests; they should not need to be anointed again, except the successive high priests. See Exodus 29:7,29 Le 4:3 16:32 21:10
Related Commentaries of Exodus 40:15
Exodus 40:15
15 And thou shalt anoint them, as thou didst anoint their father, that they may minister unto me in the priest's office: for their anointing shall surely be an everlasting priesthood throughout their generations.