במדבר, פרק ד׳, פסוק ל״ג

Maintaining the Tabernacle and transporting its many parts required careful organization and clear leadership. To ensure everything functioned smoothly, specific areas of responsibility had to be established for the different families involved in the daily work.

The tasks assigned to the family of Merari were placed directly under the watchful eye of Ithamar, the son of Aaron the priest. He was given personal responsibility to supervise their duties and ensure they were carried out properly [ביאור שטיינזלץ].

What makes this arrangement unique is the timing and specificity of the leadership. From the very beginning, the work of Merari was handed over exclusively to Ithamar. This immediate and direct assignment stands in contrast to how the duties of the Gershon family were managed. For the family of Gershon, the work was initially directed by a broad command from Aaron and all of his sons together, rather than being given to one specific leader right away [העמק דבר].