5 Go to Hezekiah, and say, The Lord, the God of David, your father, says, Your prayer has come to my ears, and I have seen your weeping: see, I will give you fifteen more years of life. 6 And I will keep you and this town safe from the hands of the king of Assyria: and I will keep watch over this town. 7 And Isaiah said, This is the sign the Lord will give you, that he will do what he has said: 8 See, I will make the shade which has gone down on the steps of Ahaz with the sun, go back ten steps. So the shade went back the ten steps 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.