Cosmas Indicopleustes, on Isa 38:1

But God who, in mercy to man, always works for his salvation, desiring to dispossess Hezekiah of that notion which his erring human judgment had suggested to him, and remembering also his virtues, did not permit him to be deluded to the end, but sent him such a sickness as led him to despair of his life. Then Isaiah the prophet going in unto him said: Set thy house in order, for thou shalt die and not live; and thus at once took away the two opinions he had entertained. For some of the Jews said that the Christ never dies, while others held that he does really die, but rises again from the dead. So by saying thou shalt die the prophet took away from him one opinion—that according to which he thought he would never die, but when he added thereto and said: thou shalt not live, he took away the other opinion, according to which others asserted that he rises from the dead. For, being under the test of sickness, he was taught by both expressions that he was not Christ. But the Prophet with great wisdom suggested to him by the power of the Holy Spirit, that he was not the Christ, when he said to him: Set thy house in order, for thou shalt die and not live; as if he said, arrange thine affairs, settling to whom thou wilt transmit thy kingdom, in order that the promise of God may be guarded against the possibility of failure, for thou art not the Christ proclaimed by the Prophets, who has a kingdom without successor, but thou shalt undoubtedly have a successor, and thou hast not done well in neglecting to beget children to succeed thee in thy kingdom. It must therefore be thy concern now to arrange thine affairs, and to declare whom thou wilt have to be thy successor in the kingdom. As he had fancied that he would have but himself for his successor, Hezekiah on coming to know otherwise wept bitterly, and having repented and turned himself on his bed to the wall—the quarter in which the Temple lay, in accordance with the practice obtaining among the Jews—he made his supplication with his thoughts, you may be sure, directed to the Temple