2 Chronicles 32:31

Howbeit in the business of the ambassadors of the princes of Babylon, who sent unto him to inquire of the wonder that was done in the land, God left him, to try him, that he might know all that was in his heart.

In the business of the ambassadors ... They brought a present (2 Chronicles 32:23) (see the notes at 2 Kings 20:12), and a letter of congratulation on his recovery, in which particular inquiries were made about the miracle of the sun's retrocession-a natural phenomenon that could not fail to excite great interest and curiosity at Babylon, where astronomy was so much studied. At the same time there is reason to believe that they proposed a defensive league against the Assyrians.

God left him, to try him ... Hezekiah's offence was not so much in the display of his military stores and treasures, as in not giving to God the glory both of the miracle and of his recovery, and thus leading those pagan ambassadors to know Him.