דברי הימים ב, פרק י״ג, פסוק י״ב

Facing an army prepared for battle, a severe warning is issued based on the powerful divine and spiritual presence within the camp of Judah. The army is led not merely by soldiers, but by three central forces marching at the very front of the battle lines [מצודת דוד, ביאור שטיינזלץ]. These forces are God, the priests who serve Him, and the trumpets used during holy service [מלבי״ם].

The trumpets are sounded directly against the opposing forces [ביאור שטיינזלץ]. This blast carries a deep spiritual significance, designed to bring a favorable memory of the men of Judah before God. As promised in the Torah, blowing these trumpets when going to war brings divine salvation [מצודת דוד]. Together, the combination of God, the priests, and the trumpets creates a definitive blast of victory against the enemy [מלבי״ם].

This spiritual lineup leads to a strict warning against engaging in combat. Because God Himself stands at the head of the camp, any military action taken against Judah is, in reality, a direct war against God. As such, the battle is doomed from the start and cannot possibly succeed [מלבי״ם].