Leviticus 7:34

The wave-breast, and the heave-shoulder Hebrew, The breast of elevation, and the shoulder of exaltation; that is, those parts which are consecrated to me by lifting, or heaving them up toward heaven. The breast or heart is the seat of wisdom; and the shoulder, of strength for action; and these two may denote that wisdom and power which were in Christ our High-Priest, and which ought to be in every priest. They also signify that God is to be served with all our heart, mind, and strength. By a statute for ever An ordinance to continue so long as the law of sacrifice should remain. And the equity of it remains still; for as they who waited at the altar were partakers with the altar, even so hath the Lord ordained that those who preach the gospel should live by the gospel, 1 Corinthians 9:13. In other words, the ministers of Christ, who devote their time and labours to his service and that of the public, have a right to be maintained by the public.