Numbers 10:4

4 If only one is sounded, the leaders—the heads of the clans of Israel—are to assemble before you.

Read Numbers 10:4 Using Other Translations

And if they blow but with one trumpet, then the princes, which are heads of the thousands of Israel, shall gather themselves unto thee.
But if they blow only one, then the chiefs, the heads of the tribes of Israel, shall gather themselves to you.
But if only one trumpet is blown, then only the leaders—the heads of the clans of Israel—must present themselves to you.

What does Numbers 10:4 mean?

John Gill's Exposition of the Bible
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.

California - Do Not Sell My Personal Information  California - CCPA Notice