2 Kings 20:1

In those days, some time during the latter part of his reign, after he had ruled fourteen years, was Hezekiah sick unto death. He was then thirty-nine years old and in the prime of his life. And the prophet Isaiah, the son of Amoz, came to him and said unto him, Thus saith the Lord, Set thine house in order, literally, "Command regarding thy house"; he was to take the steps ordinarily taken by a person expecting to die with reference to the disposal of his property and the management of his affairs; for thou shalt die, and not live, his illness was mortal unless some supernatural agency intervened.