I don't believe there were any before Moses.
When Jethro, Moses's father-in-law meets him out in the wilderness, he coaches Moses as to how to form this new people.
There are mostly judges put in place to keep the law.
Aaron, Moses's brother was placed as the High Priest at that time and his sons to oversee the tabernacle in which God resided, and the body of believers who would come and make offerings daily to the temple.
Now I have a small issue with this because there is a passage in Isaiah:
Isa 1:10 Hear the word of the LORD, ye rulers of Sodom; give ear unto the law of our God, ye people of Gomorrah.
Isa 1:11 To what purpose
is the multitude of your sacrifices unto me? saith the LORD: I am full of the burnt offerings of rams, and the fat of fed beasts; and I delight not in the blood of bullocks, or of lambs, or of he goats.
Isa 1:12 When ye come to appear before me,
who hath required this at your hand, to tread my courts?
The question is "who hath required all these sacrifices" ?
He is speaking to the "rulers of Sodom and the people of Gomorrah"
And yet we know that it is symbolic because Sodom and Gomorrah were destroyed a long long time before Isaiah.
So who is the Lord speaking to? And who required them to tread his courts?
I believe most of the Priests throughout the Bible served the King and not so much the people.
They were like the Seers and the Prophets.
When we get to Jerusalem in the NT, there is a whole New World Order.
Only the High Priests and Pharisees and Saducees are placed in roles of authority over the people by Rome.
These are not people God placed there. Those they killed like Zacharias between the altar and the court.
They invaded the capital so to speak. They took it over and ran it according to their own understanding.
When Jesus came on the scene, he was explaining to them and to the people, exactly what God required of them.
Now the Apostles and Disciples had no Priests or Lawyers ruling them, because they brought themselves under the authority of
God himself through Jesus Christ our High Priest.
It wasn't until people were being scattered about throughout Asia and forming churches in their homes, that certain people from the churches were placed to oversee and feed the flock. People brought their tithes and increases and shared everything among themselves.
They reached out to the poor and the hungry, the sick and the elderly and they all prospered even in evil times.
The Church that assumes authority over the flock today is not the same as the one in the book of Acts.
This Church was founded on Roman festivals and their rules mixed with a bit of Judaism to attract more people.
When they got tired of people following Judaism, which contained God's laws and His Holy Days,
They removed them. And placed instead their own dieties that they choose to worship.
Another New World Order. Not based on God as they proclaimed but based on falliable man.