Bamidbar 10:4

4 And if they sound but with one, then the Nasi’im, which are heads of Yisroel’s thousands, shall gather themselves unto thee.

Bamidbar 10:4 Meaning and Commentary

Numbers 10:4

And if they blow [but] with one [trumpet]
With only one of them, or but once, with one sounding, and that an even one as before:

then the princes, [which are] the heads of the thousands of Israel,
shall gather themselves unto thee:
and they only or alone, as Aben Ezra: by this token, or by this difference of blowing both trumpets, or only one, it was, easily known when the whole congregation or when the princes only were to meet Moses at the same place, the door of the tabernacle of the congregation; and all are to attend divine service, and the ministry of the word, even the whole church of God, and all the members of it, high and low, rich and poor, princes and people.

Bamidbar 10:4 In-Context

2 Make thee two tzotzerot (trumpets) of silver; of a whole piece shalt thou make them; that thou mayest use them for the calling of the Edah, and for the setting out of the machanot.

3 And when they shall sound them, Kol HaEdah shall assemble themselves to thee at the entrance of the Ohel Mo’ed.

4 And if they sound but with one, then the Nasi’im, which are heads of Yisroel’s thousands, shall gather themselves unto thee.

5 When ye sound a teruah, then the machanot that camp on the east shall go forward.

6 When ye sound a teruah the second time, then the machanot that camp on the south shall set out; they shall sound a teruah for their settings out.