18:19 All the heave offerings of the holy things, which the children of Israel offer unto the LORD, have I given thee, and thy sons and thy daughters with thee, by a statute for ever: it [is] a covenant {k} of salt for ever before the LORD unto thee and to thy seed with thee.
(k) That is, sure, stable and incorruptible.
18:19 A covenant of salt - A durable and perpetual covenant; so called here and 2Ch 13:5, either, because salt is a sign of incorruption, as being of singular use to preserve things from corruption: or, because it is ratified on their part by salt, which is therefore called the salt of the covenant, for which the priests were obliged to take care, that it should never be lacking from any meat - offering, Lev 2:13. And this privilege conferred upon the priests is called a covenant because it is given them conditionally, upon condition of their service, and care about the worship of God.
18:8-19 All believers are spiritual priests, and God has promised to take care of them. Godliness has the promise of the life that now is. And from the provision here made for the priests, the apostle shows that it is the duty of christian churches to maintain their ministers. Scandalous maintenance makes scandalous ministers. The priests were to be wholly devoted to their ministry, not diverted from it, or disturbed in it, by worldly care or business. Also, that they might be examples of living by faith, not only in God's providence, but in his ordinances. The best should be offered for the first-fruits unto the Lord. Those who think to save, by putting God off with the refuse, deceive themselves, for God is not mocked.
