Numbers 10:4 in the World English Bible
If they blow just one, then the princes, the heads of the thousands of Israel, shall gather themselves to you.
Context
3 And when they shall blow with them, all the assembly shall assemble themselves to thee at the door of the tabernacle of the congregation.
4 And if they blow but with one trumpet, then the princes, which are heads of the thousands of Israel, shall gather themselves unto thee.
5 When ye blow an alarm, then the camps that lie on the east parts shall go forward.