In this verse, the Israelites are confronting their fellow tribes, expressing deep concern over what appears to be a breach of faith. The construction of an altar by the tribes of Reuben, Gad, and the half-tribe of Manasseh is perceived as a potential act of rebellion against God. In the context of ancient Israel, altars were central to worship and sacrifices, and building one outside the designated place could imply setting up a rival center of worship. This action raises fears of disunity and a possible turning away from the covenant with God.
The verse underscores the importance of unity and fidelity in worship. It reflects the community's vigilance in maintaining their collective relationship with God and the seriousness with which they regard any actions that might threaten this bond. The Israelites' response is not just about the physical act of building an altar, but about the spiritual implications of such an act. It serves as a cautionary tale about the need for clear communication and understanding within a faith community to prevent misunderstandings and maintain harmony.