Numbers 10:3

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

Jeremiah 4:5

Say openly in Judah, give it out in Jerusalem, and say, Let the horn be sounded in the land: crying out in a loud voice, Come together, and let us go into the walled towns.

Joel 2:15-16

Let a horn be sounded in Zion, let a time be fixed for going without food, have a holy meeting:

Treasury of Scripture Knowledge

Summary

And when they shall blow with them, all the assembly shall assemble themselves to thee at the door of the tabernacle of the congregation.

General references

Bible References

General references

Jeremiah 4:5
Say openly in Judah, give it out in Jerusalem, and say, Let the horn be sounded in the land: crying out in a loud voice, Come together, and let us go into the walled towns.
Joel 2:15
Let a horn be sounded in Zion, let a time be fixed for going without food, have a holy meeting:

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