Albert Barnes Commentary 2 Kings 19:2

"And he sent Eliakim, who was over the household, and Shebna the scribe, and the elders of the priests, covered with sackcloth, unto Isaiah the prophet the son of Amoz." — 2 Kings 19:2 (ASV)

Isaiah is introduced into the history here for the first time. His own writings show that he had taken an active part in these events for many years. This was the fourth reign since he began his prophecies. During at least two of those reigns—those of Ahaz and Hezekiah—he had been a familiar counselor to the king.

He had probably counseled the revolt from Assyria and encouraged the king and people to persevere in their resistance. The exact date of prophecies can seldom be fixed with any certainty, but we can scarcely be mistaken in regarding the prophecies in Isaiah chapters 10, 30, and 31 as written around the time of Hezekiah’s second revolt.