דברי הימים א, פרק ט״ו, פסוק י״ב

Addressing the leaders of the Levite families directly serves a specific purpose. It emphasizes that the full responsibility for the upcoming mission rests entirely on their shoulders [מצודת דוד]. Before they can carry out their task, these leaders are required to prepare and purify themselves for the event [מצודת דוד, ביאור שטיינזלץ]. Only after completing this purification process are they ready to move the Ark of God. The commentators unanimously agree that their instruction is to bring the Ark directly to the exact location that was specially prepared to receive it.