I just want to think about that phrasing. What does it meant to be a priest “unto” someone or something?
A quick search shows that (I think) these are the references that have the exact words “priest unto”:
19 And they said unto him, Hold thy peace, lay thine hand upon thy mouth, and go with us, and be to us a father and a priest: is it better for thee to be a priest unto the house of one man, or that thou be a priest unto a tribe and a family in Israel?
27 So Solomon thrust out Abiathar from being priest unto the Lord; that he might fulfil the word of the Lord, which he spake concerning the house of Eli in Shiloh.
13 And they shall not come near unto me, to do the office of a priest unto me, nor to come near to any of my holy things, in the most holy place: but they shall bear their shame, and their abominations which they have committed.
This quick (and not conclusive) search has two uses of “unto.” Two results seem to use “unto” to refer to who you are under, who you serve, what order you are apart of, etc. But one result seems to use “unto” to refer to which group you are over. I suppose these aren’t mutually exclusive uses here:
Priest (serves God) (serves people)
But I still want to think about what the difference really is by saying a priest serves unto God or a priest serves unto a people.
More to think about…