Before the devastating war against Amalek begins, a striking moment of gratitude emerges on the battlefield. It highlights the sharp contrast between profound cruelty and historic kindness, showing how actions taken generations earlier continue to echo and protect descendants.
The Kenites are the family and descendants of Jethro, the father-in-law of Moses. Their presence among the Amalekite nation is surprising. The primary approach among commentators is that the Kenites were nomadic shepherds who wandered from place to place seeking pasture, eventually settling in this region [מלבי״ם, רד״ק, אברבנאל]. Conversely, a unique perspective suggests they intentionally set up their tents within Amalekite territory to serve as a hidden safe haven for Israelite refugees fleeing the battle [אהבת יהונתן].
Saul issues an urgent, repeated plea for the Kenites to separate and physically distance themselves from the Amalekite people [שטיינזלץ]. He warns them to leave immediately to avoid being swept up in the total destruction and annihilation planned for Amalek [מלבי״ם, מצודת ציון, רד״ק, שטיינזלץ]. In the chaos of war, it is impossible to distinguish between individuals and protect innocent bystanders [מצודת דוד, אהבת יהונתן]. Saul's warning is not driven by a fear that the Kenites might assist Amalek in the fight, but rather by genuine compassion and a desire to shield them in the merit of their ancestor [אברבנאל].
The justification for saving them is rooted in the historic kindness their ancestor performed. The primary approach among commentators is that this refers to Jethro's excellent advice to Moses to appoint judges, a system that greatly relieved the entire nation and improved the Israelite justice system. This teaches the principle that when someone offers good advice to a friend, God rewards their descendants long after [צאינה וראינה]. Another interpretation views this kindness as Jethro's actual conversion, an act that removed the fear of foreign nations from the hearts of the Israelites [אהבת יהונתן].
Although Jethro advised Moses directly, his actions are credited as a kindness to the entire Israelite nation. This is because Jethro hosted Moses, Aaron, and the elders of Israel for a meal. The established principle is that anyone who does a favor for the great leaders of Israel is considered to have done a kindness for the entire nation [רש״י, רד״ק, אברבנאל].
The timing of this historic kindness is highly significant. Commentators point out a precise, mirrored parallel between Jethro and Amalek. Both acted at the exact same time, just as the Israelites were leaving Egypt. However, while Amalek committed terrible evil and attacked the Israelites, Jethro showed them kindness and celebrated their success. Because their actions were complete opposites, it is unfitting for them to share the same fate and be punished together [מלבי״ם, רלב״ג, אברבנאל]. Furthermore, since Jethro was the very person who taught the Israelites how to establish righteous justice, it would be unjust for his descendants to perish senselessly in the chaos of battle [אהבת יהונתן].