Thematic Bible: What preachers should do

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

My little children, these things I write to you, that ye sin not. And if any man sinneth, 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 do know that we know him, if we keep his commandments. read more.
He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him. But whoever keepeth his word, in him verily is the love of God perfected: by this we know that we are in him. He that saith he abideth in him, ought himself also so to walk, even as he walked.