יהושע, פרק כ״ב, פסוק י״ט

A radical compromise is offered to protect the spiritual and national unity of the Israelites: the western tribes are willing to give up portions of their own land for the tribes living across the Jordan River, provided they do not establish a separate altar. This offer directly addresses a deep anxiety among the eastern tribes, who fear their land is spiritually impure. This sense of impurity stems from the fact that the central Tabernacle is not located in their territory [רד"ק, ביאור שטיינזלץ], and God did not choose to rest His presence there [רש"י].

This geographical distance poses a severe spiritual risk. It could lead the eastern tribes to mistakenly believe they are excluded from God's direct supervision and are instead subject to a lesser spiritual ruler. Consequently, they might build an altar to offer sacrifices to that subordinate power [מצודת דוד]. Alternatively, they may have built the altar dedicated to God out of a sincere, albeit misguided, feeling that their territory was simply unworthy of hosting sacrifices [מלבי"ם].

To resolve this crisis, an open invitation is extended. The eastern tribes are urged to cross the Jordan and share the western land [מצודת דוד, ביאור שטיינזלץ]. The primary goal is to preserve national cohesion by ensuring the entire nation serves God at one central Tabernacle, preventing a disastrous split into two separate groups worshiping at two different altars [מלבי"ם].

Constructing an additional altar apart from the central one [מצודת ציון] constitutes a double rebellion. First, it is a rebellion against God, as the very act of building an independent place of worship violates His direct command [מלבי"ם]. Second, it is a rebellion against the nation itself [רש"י, רד"ק, מצודת ציון]. Because the construction of this unauthorized altar will provoke divine anger and bring punishment upon all the Israelites, it is treated as a direct assault on the rest of the tribes [מצודת דוד]. Furthermore, treating a dispute among equals as a rebellion—a dynamic usually reserved for a servant rising against a master—highlights the profound depth of the crisis. The separation created by a new altar would eventually force the western tribes to disconnect as well, effectively tearing apart the people and causing everyone to rebel against the fundamental unity of Israel [מלבי"ם].