Thematic Bible: What preachers should do

Do you not know that they who minister about holy things live of the things of the temple? and they who wait at the altar are partakers with the altar? Even so has the Lord ordained that they who preach the gospel should live of the gospel.

My little children, these things write I unto you, that you sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous: And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world. And by this we know that we know him, if we keep his commandments. read more.
He that says, I know him, and keeps not his commandments, is a liar, and the truth is not in him. But whoever keeps his word, in him verily is the love of God perfected: by this we know that we are in him. He that says he abides in him ought himself also so to walk, even as he walked.