Thematic Bible: What preachers should do

Do ye not know, that they who are employed about the sacrifices have their food from the temple? and they, who attend at the altar, are partakers with the altar? So also the Lord hath ordained, that those who preach the Gospel should live of the Gospel.

My little children, I write these things unto you, that ye may not sin. 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 have known 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 whosoever keepeth his word, in him verily is the love of God perfected: and 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.