דברי הימים ב, פרק ל״ב, פסוק ל״ב

At the conclusion of King Hezekiah's reign, the summary of his life and his legacy is directed toward the written sources that documented his era. His historical record is distinctly defined by his benevolent deeds and acts of kindness [ביאור שטיינזלץ].

These noble actions were preserved within the prophetic visions and words of Isaiah [מצודת דוד]. Isaiah was uniquely positioned to record this history, having begun his mission many years before the king took the throne. By the time of Hezekiah's rule, Isaiah was already established as a great prophet whose predictions consistently came true [ביאור שטיינזלץ].

The historical accounts actually rely on multiple written sources [מצודת דוד]. While some of Hezekiah's deeds are found within the well-known prophecies of Isaiah, it appears the prophet authored another distinct text. This additional book contained the remainder of the king's history and was ultimately included as part of the broader chronicles of the kings of Judah and Israel [ביאור שטיינזלץ].