Kings IV 20:6

6 And I will add to thy days fifteen years; and I will deliver thee and this city out of the hand of the king of the Assyrians, and I will defend this city for my own sake, and for my servant's David sake.

Kings IV 20:6 In-Context

4 And Esaias was in the middle court, and the word of the Lord came to him, saying,
5 Turn back, and thou shalt say to Ezekias the ruler of my people, Thus saith the Lord God of thy father David, I have heard thy prayer, I have seen thy tears: behold, I will heal thee: on the third day thou shalt go up to the house of the Lord.
6 And I will add to thy days fifteen years; and I will deliver thee and this city out of the hand of the king of the Assyrians, and I will defend this city for my own sake, and for my servant's David sake.
7 And he said, Let them take a cake of figs, and lay it upon the ulcer, and he shall be well.
8 And Ezekias said to Esaias, What the sign that the Lord will heal me, and I shall go up to the house of the Lord on the third day?

The Brenton translation of the Septuagint is in the public domain.