Grotius is of opinion that this song was dictated by Isaiah. But it is more probable, as Hezekiah was a truly pious man, and inspired by the Holy Spirit, that he was moved thereby to write this form of thanksgiving, both as a testimony of his own gratitude to God, and for the instruction of future ages.
Related Commentaries of Isaiah 38:9
Isaiah 38:9
9 The writing of Hezekiah king of Judah, when he had been sick, and was recovered of his sickness: