"Put the trumpet to your lips! Something like an eagle is over Yahweh's house, Because they have broken my covenant, And rebelled against my law.
He says first, A trumpet to thy mouth, or, “Set to thy mouth the trumpet.” It is an exhibition, (hypotyposis;) for we know that God, in order to affect more powerfully the people, clothes his Prophets with various characters. The Prophet then is introduced here as a herald who proclaims war, or a messenger, or by whatever name you may be pleased to call him. Here then the Prophet is commanded, not to speak with his mouth, but to show by the trumpet that war was nigh, as though God himself by his trumpet declared war against Israel, which was to be carried on soon after by earthly enemies. The enemies were soon after to come, and the herald was to come in the usual manner to declare war. The Greeks call them κηρρυκες, proclaimers, we say, “Les heraux “. As these earthly kings have their proclaimers, or κηρυκες, or heralds, or messengers, who proclaim war; so the Lord sends his Prophet with the usual charge to declare war: “Go then, and let the Israelites know, not now by thy mouth, but even by thy throat, by the sound of the trumpet, that I am an enemy to them, and that I am present with a strong army to destroy them.” It is indeed certain that the Prophet did not use a trumpet; but the Lord by this representations as I have already said increased the reality of what was taught that the Israelites might perceive, that it was not in sport or in play that the Prophet threatened them, but that it was done seriously, as though they now saw the heralds who was to proclaim war; for this was not usually done except when the army is already prepared for battle. 