במדבר, פרק כ״ז, פסוק כ״א

The transition of leadership from Moses to Joshua brings a fundamental shift in how the nation is guided. Unlike Moses, who experienced direct revelation, the new model requires shared authority and a structured system of mediation. Joshua's prophetic vision is not as absolute as his predecessor's, necessitating spiritual assistance. While Joshua commands the military and manages outward affairs, Eleazar the High Priest serves as the spiritual conduit through which God's answers are received [רלב״ג, מלבי״ם, ביאור שטיינזלץ]. Requiring Joshua to stand before Eleazar serves to remind the new leader of his position and prevents arrogance [חזקוני], as the political leader remains subordinate to the priest during these moments of divine inquiry [העמק דבר]. This arrangement also acts as a divine response to Moses's unspoken hope that his own sons would succeed him. God comforts him by ensuring that the highest honor remains within his family, as the new leader will depend entirely on Eleazar, Moses's nephew [רש״י, מזרחי, שפתי חכמים].

When national guidance is required, the inquiry is made quietly, reminiscent of Hannah's silent prayer [תורה תמימה]. Eleazar presents the question to God on Joshua's behalf [שד״ל, רש״ר הירש]. This method is reserved strictly for matters of national consequence, such as deciding to go to war or broad leadership strategies, rather than for deciding standard matters of religious law [רש״י, רש״ר הירש, תורה תמימה, העמק דבר]. The answers arrive through the Urim, the illuminating letters on the stones of the High Priest's breastplate, which signal God's will [תורה תמימה, ביאור שטיינזלץ]. The primary approach among commentators explains that the Urim are the essential element—the actual glowing letters—while the Thummim merely provide the power to combine these letters into coherent words [רבנו בחיי]. This divine judgment is absolute and irrevocable, unlike a prophetic decree which can sometimes be overturned. Yet, the specific combination of the letters can be influenced to shift from a negative outcome to a positive one through Joshua's prayer, highlighting a profound interplay between the absolute divine decree and human petition [רבנו בחיי, תורה תמימה, חתם סופר].

The ultimate authority to mobilize the nation is a matter of layered interpretation. The primary approach among commentators is that the people mobilize for war specifically by the word of Eleazar [רש״י, רבנו בחיי, אבן עזרא, רש״ר הירש, מלבי״ם]. Another perspective suggests that the command is attributed directly to God or the verdict of the Urim itself [אור החיים, אבן עזרא, ברכת אשר]. Conversely, some maintain that while Joshua must consult the priest, he retains the authority to issue the final practical command to the troops [רלב״ג]. A synthesizing view proposes that while the Urim's message is delivered through Eleazar, the favorable arrangement of the letters is achieved through Joshua's spiritual intervention [חתם סופר].

Mobilizing the nation requires the involvement of distinct societal factions. The directive applies to the leader himself [תורה תמימה], the general populace or the army marching behind him [אבן עזרא, רלב״ג, תורה תמימה], and a distinct representative body—the Sanhedrin, the great high court whose members convene at the Tent of Meeting. This detailed breakdown establishes a crucial limitation on executive power. A leader cannot declare war unilaterally as an absolute monarch. Instead, military action requires a tripartite consensus: the leader's initiative, the divine sanction received through the High Priest, and the formal approval of the Sanhedrin [רש״י, רבנו בחיי, אבן עזרא, רלב״ג, רש״ר הירש, תורה תמימה, משכיל לדוד, אבי עזר].