Numbers 10:7

Christian Standard Bible

When calling the assembly together, you are to sound long blasts, not short ones.

Cross References

Joel 2:1

Blow the ram’s horn in Zion; sound the alarm on my holy mountain! Let all the residents of the land tremble, for the day of the  Lord is coming; in fact, it is near —

Numbers 10:8

The sons of Aaron, the priests, are to sound the trumpets. Your use of these is a permanent statute throughout your generations.