Isaiah 38:9 - Ellicott's Commentary On The Whole Bible

The writing of Hezekiah... — Isaiah 38:21-22 would seem to have their right place before the elegiac psalm that follows. The culture which the psalm implies is what might have been expected from one whom Isaiah had trained, who had restored and organised the worship of the Temple (2 Chronicles 29:25-30), who spoke to Levites and soldiers as a preacher (2 Chronicles 30:22; 2 Chronicles 32:6), “speaking comfortably” (literally, to their heart), and who had directed the compilation of a fresh set of the proverbs ascribed to Solomon (Proverbs 25:1). It will be seen, as we go through the hymn, that it presents echoes of the Book of Job as well as of the earlier Psalms.