Numbers 10:8

And the sons of Aaron the priests shall blow with the
trumpets
Eleazar and Ithamar, the one with the one and the other with the other, there being at first but two, as there were but two priests; but in Solomon's time there were an hundred twenty priests, and as many trumpets, ( 2 Chronicles 5:12 ) ; hence Maimonides says ^F12, there were never fewer than two trumpets, nor more than an hundred twenty;

and they shall be to you for an ordinance for ever throughout your
generations:
for they were not only for present use, for the journeying of the camps in the wilderness, but for calling together the assembly in later times, as well as for other uses next mentioned; which would obtain in future ages till the coming of Christ, and even under the Gospel dispensation the mystical use of them continues, the preaching of the everlasting Gospel.

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FOOTNOTES:

F12 Hilchot Cele Hamikdash, c. 3. sect. 4.