Thematic Bible: What preachers should do

Do ye not know, that they who minister in the offerings of the temple live from the temple? that they who serve at the altar share with the altar? In like manner also did the Lord ordain that they who preach the gospel should live from the gospel.

My children, these things I write to you, that ye may not sin. And if any one have sinned, we have an advocate with the Father, Jesus Christ the righteous. And he is a propitiation for our sins; and not for ours only, but also for the whole world. And hereby we 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, truly in him is the love of God 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.