Thematic Bible: What preachers should do

Know ye not, that they who are employed about holy things, are fed out of the temple? And they who wait at the altar, are partakers with the altar. So also hath the Lord ordained, that they who preach the gospel, should live of the gospel.

My beloved children, I write these things to you, that ye may not sin. But if any one 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 hereby we know that we know him, if we keep his commandments. read more.
He that faith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him. But whoso keepeth his word, verily in him the love of God is perfected: hereby we know that we are in him. He that saith, he abideth in him, ought himself also so to walk, even as he walked.