Following the exhaustion of battle and a brief pause to eat and recover, an opportunity emerges for a final military victory. Riding the momentum of a retreating enemy, the king seeks to strike a final blow. Yet, this initiative brings to the surface a deep tension between quick military judgment and the duty to seek Divine guidance. King Saul proposes a night pursuit to completely wipe out the enemy and gather their plunder [מצודת ציון]. Operating under the assumption that the Philistines are already fully defeated and fleeing, he believes all that remains is to collect the spoils and eliminate the survivors. Filled with this confidence, it does not even occur to him to consult the Urim and Thummim before setting out [מלבי״ם, ביאור שטיינזלץ]. The people, swept up in the enthusiasm of the moment, give the king their full support to do whatever he sees fit.
However, this sudden rush is halted by the priest, who demands a change in the order of events. He calls the leaders to step forward and approach the Ark of God [מצודת ציון, ביאור שטיינזלץ], instructing them that they must first seek God's word [רד״ק]. Now that there is a brief window of available time, the priest insists it is the proper moment to pause and consult the Urim and Thummim [ביאור שטיינזלץ].
The commentators offer two complementary reasons for the priest's intervention. On a spiritual level, he rebukes Saul for acting purely on human impulse without seeking closeness to God, reminding the king that His protection in battle is only guaranteed when they actively seek His direction [אברבנאל]. From a practical military standpoint, the priest warns against complacency. There is a real danger that the Philistines have used the brief pause in fighting to fall back, regroup, and reorganize within their cities. Continuing a blind pursuit without Divine approval poses a serious risk [מלבי״ם].