Isaiah 38:19 - Ellicott's Commentary On The Whole Bible

The father to the children... — The words are perfectly general, but they receive a special significance from the fact that Hezekiah’s son and successor, Manasseh, who was only twelve years old at his father’s death (2 Kings 21:1), was not born till two or three years afterwards. At the time of his illness the king may still have been childless, and the thought that there was no son to take his place may have added bitterness to his grief. “Thy truth,” has here the sense of “faithfulness” rather than of the truth about God which is the object of belief.