Charles Spurgeon Commentary Jeremiah 33:17-18

"For thus saith Jehovah: David shall never want a man to sit upon the throne of the house of Israel; neither shall the priests the Levites want a man before me to offer burnt-offerings, and to burn meal-offerings, and to do sacrifice continually." — Jeremiah 33:17-18 (ASV)

This shows that the covenant was not a literal and fleshly one, made with David and his seed according to the flesh, or with the priests and their seed according to the flesh. There is a Kingdom that can never be moved, and our Lord sits on that throne; there is a Priesthood which is everlasting, it is held by that great High Priest who has offered one sacrifice for sins forever, and who remains a Priest forever after the order of Melchisedec.