Per God's Word in the OT, it was the priest's job to read God's Word to the people and give them the meaning. That is also how our Lord Jesus meant for Peter to feed His sheep.
There's 3 main offices, the pastor, the evangelist, and the minister.
In most small Churches the preacher has to try to be all three offices. But in larger Churches there's usually a pastor who only teaches Bible and is a scholar, and then there are evangelists that only preach The Gospel Good News, and then there are separate ministers that handle various duties like administration, visiting the sick and elderly, etc.
Apostle Paul fulfilled all three offices, so he actually is the best example of that.