(6) I will add unto thy days fifteen years.--In the Jewish reckoning fourteen years and a fraction of a year would count as fifteen years. With this very definite prediction comp. Isaiah 7:8; Isaiah 23:15; Jeremiah 25:11-12.

And I will deliver thee . . .--So that the Assyrians had not yet retired from the West. For the rest of the verse see 2Kings 19:34.

Verse 6. - And I win add unto thy days fifteen years. God "does exceeding abundantly more than we either ask or think" (Ephesians 3:20). Hezekiah had asked for nothing more than immediate escape from death. God grants him fifteen additional years of life, i.e. more than doubles the length of his reign. And I will deliver thee and this city out of the hand of the King of Assyria. If Hezekiah's illness took place in B.C. 713, and Jerusalem was then in danger of being attacked by the Assyrians, the king who threatened the attack must have been Sargon. Sargon made an expedition into Palestine in B.C. 720, another in B.C. 713, and a third in B.C. 711. In none of them does he seem to have invaded Judaea; but in the third he counts the Jews among his enemies ('Eponym Canon,' p. 130, line 32). Hezekiah, who had revolted from him (2 Kings 18:7), may well have felt alarm both in B.C. 713 and 711. And I will defend this city for mine own sake, and for my servant David's sake (comp. 2 Kings 19:34). The promise given in B.C. 713 in respect of Sargon was repeated in B.C. 699 (?) with respect to Sennacherib in almost the same words.

20:1-11 Hezekiah was sick unto death, in the same year in which the king of Assyria besieged Jerusalem. A warning to prepare for death was brought to Hezekiah by Isaiah. Prayer is one of the best preparations for death, because by it we fetch in strength and grace from God, to enable us to finish well. He wept sorely: some gather from hence that he was unwilling to die; it is in the nature of man to dread the separation of soul and body. There was also something peculiar in Hezekiah's case; he was now in the midst of his usefulness. Let Hezekiah's prayer, see Isa 38. interpret his tears; in that is nothing which is like his having been under that fear of death, which has bondage or torment. Hezekiah's piety made his sick-bed easy. O Lord, remember now; he does not speak as if God needed to be put in mind of any thing by us; nor, as if the reward might be demanded as due; it is Christ's righteousness only that is the purchase of mercy and grace. Hezekiah does not pray, Lord, spare me; but, Lord, remember me; whether I live or die, let me be thine. God always hears the prayers of the broken in heart, and will give health, length of days, and temporal deliverances, as much and as long as is truly good for them. Means were to be used for Hezekiah's recovery; yet, considering to what a height the disease was come, and how suddenly it was checked, the cure was miraculous. It is our duty, when sick, to use such means as are proper to help nature, else we do not trust God, but tempt him. For the confirmation of his faith, the shadow of the sun was carried back, and the light was continued longer than usual, in a miraculous manner. This work of wonder shows the power of God in heaven as well as on earth, the great notice he takes of prayer, and the great favour he bears to his chosen.And I will add unto thy days fifteen years,.... See Gill on Isaiah 38:5.

and I will deliver thee, and this city, out of the hand of the king of Assyria; by which it appears that this sickness and recovery were before the destruction of the Assyrian army:

and I will defend this city for mine own sake, and for my servant David's sake: for the sake of his honour and glory in the temple, and the service of it, that were in Jerusalem, and for the sake of his promise to David and his seed.