An interesting scripture is
Nehemiah 6:7: "Thou hast appointed prophets to preach." Though some have said that prophets prophesy and preachers preach, but this proves that prophets or prophetesses preach.
Jonah 3:2: "Arise, go to Ninevah, that great city, and preach unto it the preaching that I lead thee." No wonder the Bible teaches that to believe we must have a preacher to preach (
Romans 10:14-15).