We have here directions concerning the public notices that were to be given to the people upon several occasions by sound of trumpet. In a thing of this nature, one would think, Moses needed not to have been taught of God: his own reason might teach him the conveniency of trumpets; but the constitution of Israel was to be in every thing divine, and therefore even in this matter, small as it seems. Moses is here directed, 1. About the making of them. They must be made of silver; not cast but of beaten work (as some read it), the matter and shape, no doubt, very fit for the purpose. He was now ordered to make but two, because there were but two priests to use them. But in Solomon's time we read of 120 priests sounding with trumpets, Ch2 5:12. The form of these trumpets is supposed to have been much like ours at this day. 2. Who were to make use of them; not any inferior person, but the priests themselves, the sons of Aaron, Num 10:8. As great as they were, they must not think it a disparagement to them to be trumpeters in the house of God; the meanest office there was honourable. This signified that the Lord's ministers should lift up their voice like a trumpet, to show people their sins (Isa 58:1), to call them to Christ, Isa 27:13. 3. Upon what occasions the trumpets were to be sounded. (1.) For the calling of assemblies, Num 10:2. Thus they are told to blow the trumpet in Zion for the calling of a solemn assembly together, to sanctify a fast, Joe 2:15. Public notice ought to be given of the time and place of religious assemblies; for the invitation to the benefit or ordinances is general: whoever will, let him come. wisdom cries in the chief places of concourse. But, that the trumpet might not give an uncertain sound, they are directed, if only the princes and elders were to meet, to blow but one of the trumpets; less should serve to call them together, who ought to be examples of forwardness in any thing that is good: but, if the body of the people were to be called together, both the trumpets must be sounded, that they might be heard at the greater distance. In allusion to this, they are said to be blessed that hear the joyful sound (Psa 89:15), that is, that are invited and called upon to wait upon God in public ordinances, Psa 122:1. And the general assembly at the great day will be summoned by the sound of the archangel's trumpet, Mat 24:31. (2.) For the journeying of the camps, to give notice when each squadron must move; for no man's voice could reach to give the word of command: soldiers with us that are well disciplined may be exercised by beat of drums. When the trumpets were blown for this purpose, they mustsound an alarm (Num 10:5), a broken, quavering, interrupted sound, which was proper to excite and encourage the minds of people in their marches against their enemies; whereas a continued equal sound was more proper for the calling of the assembly together (Num 10:7): yet when the people were called together to deprecate God's judgments we find an alarm sounded, Joe 2:1. At the first sounding, Judah's squadron marched, at the second Reuben's, at the third Ephraim's, at the fourth Dan's, Num 10:5, Num 10:6. And some think that this was intended to sanctify their marches, for thus were proclaimed by the priests, who were God's mouth to the people, not only the divine orders given them to move, but the divine blessing upon them in all their motions. He that hath ears, let him hear that God is with them of a truth. King Abijah valued himself and his army very much upon this (Ch2 13:12), God himself is with us for our captain and his priests with sounding trumpets. (3.) For the animating and encouraging of their armies, when they went out in battle (Num 10:9): "If you go to war, blow with the trumpets, signifying thereby your appeal to heaven for the decision of the controversy, and your prayer to God to give you victory; and God will own this his own institution, and you shall be remembered before the Lord your God." God will take notice of this sound of the trumpet, and be engaged to fight their battles, and let all the people take notice of it, and be encouraged to fight his, as David, when he heard a sound of a going upon the tops of the mulberry trees. Not that God needed to be awaked by sound of trumpet any more than Christ needed to be awaked by his disciples in the storm, Mat 8:25. But where he intends mercy it is his will that we should solicit it; ministers must stir up the good soldiers of Jesus Christ to fight manfully against sin, the world, and the devil, by assuring them that Christ is the captain of their salvation, and will tread Satan under their feet. (4.) For the solemnizing of their sacred feasts, Mat 8:10. One of their feasts was called a memorial of the blowing of trumpets, Lev 23:23, etc. And it should seem they were thus to grace the solemnity of all their feasts (Psa 81:3), and their sacrifices (Ch2 29:27), to intimate with what joy and delight they performed their duty to God, and to raise the minds of those that attended the services to a holy triumph in the God they worshipped. And then their performances were for a memorial before God; for he takes pleasure in our religious exercises when we take pleasure in them. Holy work should be done with holy joy.

And when ye go to war in your land against the enemy that oppresseth you,.... That enters in to invade it, to besiege cities, and distress the inhabitants of it:

then ye shall blow an alarm with the trumpets: a "tara-tan-tara" with both of them, to call the several tribes together to join against the enemy; or to call them to fasting and humiliation, to repentance and prayer, to seek the Lord in the exercise of these, and cry for help and assistance, for victory and salvation; for, as Ben Gersom observes, by this alarm their hearts would be broken and become contrite, and they would return to the Lord, and he would have mercy on them when they pray unto him; for such a sound makes a man's heart shake and tremble, according to Amo 3:6; see Jer 4:19; this is a third use of the trumpets, and in a mystical sense it may be observed, that saints are in a militant state, and have many enemies that come in to them to oppress them, sin, Satan, and the world; and the Gospel calls and encourages them to fight, furnishes them with armour, and assures them of victory, and directs them where to fight and with whom, and bids them endure hardness as good soldiers of Christ:

and ye shall be remembered before the Lord your God; for a book of remembrance is written for them that fear God, humble themselves before him, and pray unto him:

and ye shall be saved from your enemies; as Israel from their temporal, so the people of God from their spiritual enemies, being made more than conquerors through him that loved them.

If ye go to war--In the land of Canaan, either when attacked by foreign invaders or when they went to take possession according to the divine promise, "ye [that is, the priests] shall blow an alarm." This advice was accordingly acted upon (Num 31:6; Ch2 13:12); and in the circumstances it was an act of devout confidence in God. A solemn and religious act on the eve of a battle has often animated the hearts of those who felt they were engaged in a good and just cause; and so the blowing of the trumpet, being an ordinance of God, produced that effect on the minds of the Israelites. But more is meant by the words--namely, that God would, as it were, be aroused by the trumpet to bless with His presence and aid.