Jeremiah 33:22

As the host of heaven cannot be numbered, neither the sand of
the sea measured
As the stars of heaven are innumerable, and the sand of the sea immeasurable: so will I multiply the seed of David my servant;
the Messiah; the son and antitype of David; and who is often called by his name; and as the son of David is the servant of the Lord, his spiritual seed are meant, which shall endure for ever; and in Gospel times, especially in the latter part of them, shall be very numerous; see ( Psalms 89:29 Psalms 89:36 ) ; and the Levites that minister unto me;
meaning the same as before; not ministers of the Gospel, for they never were, or will be, so numerous as here expressed; but true believers in Christ, who are all priests unto God, and minister in holy things, offering up the spiritual sacrifices of prayer and praise through Christ: these Levites are the same with the seed of David, or Christ, in whom the kingdom and the priesthood are united.