שמואל א, פרק כ״ט, פסוק ה׳

The Philistine commanders express deep distrust of David as they prepare for battle. Their fear is firmly rooted in his legendary military past and the widespread reputation he holds. To prove the grave danger of allowing him to join their ranks, they recall a famous song once sung loudly to the accompaniment of musical instruments [מצודת ציון].

This song of praise serves as a stark reminder that David has always been a sworn enemy of the Philistines. Because he has struck them down numerous times, he simply cannot be trusted [מצודת דוד]. Furthermore, his immense bravery makes him a severe internal threat. The commanders worry that despite the ongoing conflict between David and Saul, David might seize the opportunity of the current war to turn against the Philistines. By doing so, he could appease his master and secure a safe return to the Israelite side [רד"ק, ביאור שטיינזלץ].

Taking a different view of his potential motives, another approach suggests that even if David’s rebellion against Saul was driven by a personal ambition to take the throne, he remains entirely unreliable to his new allies. In this scenario, he might betray the Philistines and fight against them purely to reclaim his former glory. By securing a massive victory, he would ensure that the people once again sing the famous song praising his triumphs, thereby advancing his ultimate goal of leading the nation [מלבי"ם].