5 "Go and tell Hezekiah, 'Thus says the Lord, the God of David your father: "I have heard your prayer, I have seen your tears; surely I will add to your days fifteen years. 6 I will deliver you and this city from the hand of the king of Assyria, and I will defend this city." ' 7 And this is the sign to you from the Lord, that the Lord will do this thing which He has spoken: 8 Behold, I will bring the shadow on the sundial, which has gone down with the sun on the sundial of Ahaz, ten degrees backward." So the sun returned ten degrees on the dial by which it had gone down.
Matthew Henry's Commentary on Isaiah 38:5-8
Commentary on Isaiah 38:1-8
(Read Isaiah 38:1-8)
When we pray in our sickness, though God send not to us such an answer as he here sent to Hezekiah, yet, if by his Spirit he bids us be of good cheer, assures us that our sins are forgiven, and that, whether we live or die, we shall be his, we do not pray in vain. See 2 Kings 20:1-11.