שמות, פרק י״ז, פסוק י״ב

During the fierce battle against Amalek, the Israelites' victory hinged entirely on Moses keeping his hands raised toward heaven. As the hours wore on, the sheer physical exertion took its toll, and his arms began to lower. The primary approach among commentators is that this was a simple human reality. No person, no matter how heroic, can hold their arms in the air for hours without pause, especially an elderly and exceptionally tall man like Moses [אבן עזרא, רלב״ג, עמק דבר].

Beyond the physical strain, this heaviness carried profound spiritual implications. Moses was acting as an active conduit, channeling goodness and salvation from a higher source down to the Israelites [הכתב והקבלה]. However, some view the sudden weight in his arms as a form of consequence. Because Moses had delegated the actual fighting to Joshua rather than leading the battle himself, his hands became burdensome and difficult to lift [רש״י, גור אריה]. Alternatively, the heavy hands reflected the spiritual state of the people. With many among the Israelites lacking faith, the weight of their materialism dragged down the spiritual elevation Moses was desperately trying to achieve [מלבי״ם].

To stabilize him, the leaders placed a stone under Moses for him to sit on. The choice of a hard rock rather than a comfortable cushion was an act of deep empathy. Moses felt that while the Israelites were suffering in the agony of war, he had no right to sit in comfort and needed to physically share in the public distress [רש״י, תורה תמימה]. Practically, his seated position made it much easier for Aaron and Hur to support him, as Moses's great height would have otherwise put his hands out of their reach [שד״ל, פרדס יוסף]. Symbolically, the stone represents the unity of the Israelites, echoing the foundational stones of Jacob, and serves as a reminder that salvation only comes when the nation binds together as one [מלבי״ם].

With Moses seated in the center, Aaron and Hur stood on either side, holding his arms aloft. Moses drew strength from their combined support, positioned much like a High Priest flanked by his deputy and the head of the ancestral house [רבנו בחיי]. This collaboration conveys a vital message about the nature of the conflict. Unlike the splitting of the Red Sea, which was an overt miracle performed by Moses alone, the war with Amalek was fought through natural means. In such struggles, the Israelites can only achieve victory through mutual support and cooperation [קונטרס חיבה יתירה]. Furthermore, this image of three leaders standing united established a lasting practice, teaching that on a public fast day, three people must lead the congregation in prayer [תורה תמימה].

Supported by his peers, Moses's hands achieved a state of enduring strength and stability, remaining firmly elevated [רמב״ן, רשב״ם, חזקוני]. Spiritually, his arms were spread toward heaven in sincere, unwavering prayer [רש״י, נתינה לגר]. They stood as a physical symbol meant to awaken the faith of the Israelites. As long as the people directed their gaze upward and subjected their hearts to God in heaven, they were saved [עמק דבר, חתם סופר]. This moment also drew upon deep ancestral merits, with the steadfastness of the act conceptually linked to the faith of Abraham, the arrival of Isaac, and the setting sun of Jacob [בעל הטורים, רבנו בחיי]. Additionally, Moses's ten raised fingers alluded to higher spiritual spheres, revealing the mystical foundation for the Priestly Blessing where priests elevate their hands to bless the congregation [רמב״ן, רבנו בחיי].

This posture of faithful endurance lasted until the end of the day, marking the conclusion of the battle [עמק דבר, קאסוטו]. The specific mention of the sun setting also indicates that the Israelites were observing a public fast, which naturally concluded at nightfall [תורה תמימה]. Yet, a deeper conflict was occurring in the heavens. The Amalekites were expert astrologers who had calculated the precise hours their fortunes would peak. To thwart them, Moses prayed to God to halt the sun and moon, scrambling the hours so that Amalek's astrological calculations were rendered powerless [רש״י, תולדות יצחק, צאינה וראינה]. Ultimately, the setting sun represents the standard laws of nature. The enduring power of Moses's prayer points toward a future era when nature's dominance will be overturned, hinting at the Messianic age and future redemptions where his merit will continue to protect the Israelites until the end of days [עמק דבר, כלי יקר].