Joseph Benson's Commentary of the Old and New Testaments - Exodus 40:15
Exodus 40:15. Their anointing shall be an everlasting priesthood A seal that their priesthood shall continue as long as the Jewish polity lasts. He signifies that this unction should be sufficient for all succeeding priests. None were afterward anointed but the high-priests. read more
The Pulpit Commentary - Exodus 40:15
Thou shalt anoint them as thou didst anoint their father. The mode of anointing does not seem to have been identical in the two cases. The oil was first poured upon Aaron's head (Le Exodus 8:12 ; Psalms 133:2 ), and afterwards sprinkled upon him (Le Exodus 8:30 ). It was, apparently, only sprinkled upon the priests ( ib, ). This was a lower form of anointing; and hence the high priest was sometimes called " the anointed priest" (Le Exodus 4:5 , Exodus 4:16 ; Exodus 6:22 ; ... read more