But when the congregation is to be gathered together,.... At the door of the tabernacle of the congregation, and not to move in separate camps or bodies one after another:

you shall blow, but you shall not sound an alarm; blow with an even and uninterrupted sound, and not with a broken and quavering one; by which the congregation and camps were distinguished from one another, the same certain sound being given to each constantly, whereby they knew which were called to motion: see 1 Corinthians 14:8; according to Ben Gersom blowing was a voice drawn out, and joined or continued; an alarm, a voice not joined, but broken.

But to call the congregation together they were to blow, not to sound an alarm. תּקע signifies blowing in short, sharp tones. הריע equals תּרוּעה תּקע, blowing in a continued peal.

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

10:1-10 Here are directions concerning the public notices to be given the people by sound of trumpet. Their laws in every case were to be Divine, therefore, even in this matter Moses is directed. These trumpets typify the preached gospel. It sounds an alarm to sinners, calls them to repent, proclaims liberty to the captives and slaves of Satan, and collects the worshippers of God. It directs and encourages their heavenly journey; stirs them up to combat against the world and sin, encouraging them with the assurance of victory. It leads their attention to the sacrifice of Christ, and shows the Lord's presence for their protection. It is also necessary that the gospel trumpet give a distinct sound, according to the persons addressed, or the end proposed; whether to convince, humble, console, exhort, reprove, or teach. The sounding of the trumpet of the gospel is God's ordinance, and demands the attention of all to whom it is sent.