True Priest are of the descendants of the Tribe of Levi; made famous because of Moses, and Aaron. Christ Jesus mother, and John the Baptist mother, were both daughters of Aaron. The Priesthood[Ex.40:15] is "everlasting". The anointing for this office, is also "everlasting".
"That they may minister unto Me" is the responsibility of the Priest: how so? The Priest are boots on the ground people that worship the Lord with their walk. Remember the parable of the Sheep, and the goats. The Priesthood changed with Christ on the Cross.
The temple Veil[holiest place in the temple] damaged from top to bottom at the very moment that the death-sentence was carried out; the Hypocrite-system was "Finished". Religion had to be checked, in order for Christ Jesus to bring in the Kingdom of Heaven, on earth.
The Royal Priesthood [1Peter2:9], the chosen generation, a Holy-Nation, a peculiar people is right here, right - now. Priest - minister, to God, by serving mankind. Hood = covering: short for neighborhood.
Priest understand Faith, and speaking - into existence, just as our Creator did. Priest understand that "death and life is in the power of the tongue". "Occupy until I return" is an order that is accomplished with the Holy Spirit, and Holy Righteous Angels here to respond to our "words". Priest are not afraid of getting their boots dirty.