Jeremiah 33:18-22

18Neither shall the priests the Levites lack a man before me to offer burnt offerings, and to kindle meat offerings, and to offer sacrifice continually. 19And the word of the LORD came to Jeremiah, saying, 20Thus saith the LORD; If ye can break my covenant of the day, and my covenant of the night, so that there should not be day and night in their season; 21Then also may my covenant be broken with David my servant, that he should not have a son to reign upon his throne; and with the Levites the priests, my ministers. 22As the host of heaven cannot be numbered, neither the sand of the sea measured: so will I multiply the seed of David my servant, and the Levites that minister to me.