Thematic Bible: What preachers should do

Do you not know that those who perform the temple services eat the food from the temple, and those who serve at the altar share in the offerings of the altar? In the same way, the Lord has commanded that those who preach the gospel should earn their living by the gospel.

My little children, I am writing you these things so that you may not sin. But if anyone does sin, we have an advocate with the Father-Jesus Christ the righteous One. He Himself is the propitiation for our sins, and not only for ours, but also for those of the whole world. This is how we are sure that we have come to know Him: by keeping His commands. read more.
The one who says, "I have come to know Him," without keeping His commands, is a liar, and the truth is not in him. But whoever keeps His word, truly in him the love of God is perfected. This is how we know we are in Him: the one who says he remains in Him should walk just as He walked.