Numbers 10:7

When convening the assembly, however, you shall blow without sounding an alarm.

Joel 2:1

Blow a trumpet in Zion,
And sound an alarm on My holy mountain!
Let all the inhabitants of the land tremble,
For the day of the Lord is coming;
Surely it is near,

Numbers 10:3-4

When both are blown, all the congregation shall gather themselves to you at the doorway 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 both are blown, all the congregation shall gather themselves to you at the doorway of the tent of meeting.

Sound

Joel 2:1
Blow a trumpet in Zion,
And sound an alarm on My holy mountain!
Let all the inhabitants of the land tremble,
For the day of the Lord is coming;
Surely it is near,