דברי הימים ב, פרק ל״ה, פסוק ד׳

Preparing for the Temple service was not simply a matter of gathering to work; it required strict organization and a deep respect for historical order. The Levites were instructed to ready themselves for their sacred duties by organizing into their specific family divisions and work shifts [מצודת דוד, ביאור שטיינזלץ].

This preparation, however, went beyond basic readiness. It required a proactive effort to carefully trace and verify their family lineages, ensuring that every individual was accurately placed into the correct ancestral division [רלב״ג].

This highly structured system was not a new invention. The Levites were guided to follow the written records of King David and his son King Solomon. By doing so, they ensured that the arrangement of their shifts perfectly matched the original regulations established when the Temple service was first founded [מצודת דוד, ביאור שטיינזלץ].