Numbers 10:7

But when all the people are to come together, the horn is to be sounded but not loudly.

Joel 2:1

Let the horn be sounded in Zion, and a war-cry in my holy mountain; let all the people of the land be troubled: for the day of the Lord is coming;

Numbers 10:3-4

When they are sounded, all the people are to come together to you at the door of the Tent of meeting.

Treasury of Scripture Knowledge

Summary

But when the congregation is to be gathered together, ye shall blow, but ye shall not sound an alarm.

Ye shall blow

Sound

Bible References

Ye shall blow

Numbers 10:3
When they are sounded, all the people are to come together to you at the door of the Tent of meeting.

Sound

Joel 2:1
Let the horn be sounded in Zion, and a war-cry in my holy mountain; let all the people of the land be troubled: for the day of the Lord is coming;

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain