Hezekiah’s Sickness and the Sundial
Many date Hezekiah’s sickness and the visit of Babylonian envoys as having occurred prior to Sennacherib’s invasion. One reason for this is the fact that Hezekiah proudly shows the wealth of the national treasuries to the Babylonians, as we’ll see (2 Kings 20:13 2 Kings 20:13And Hezekiah listened to them, and showed them all the house of his precious things, the silver, and the gold, and the spices, and the precious ointment, and all the house of his armor, and all that was found in his treasures: there was nothing in his house, nor in all his dominion, that Hezekiah showed them not.
American King James Version×)—and yet Hezekiah gave away much of the treasuries to Sennacherib (2 Kings 18:15-16 2 Kings 18:15-16  And Hezekiah gave him all the silver that was found in the house of the LORD, and in the treasures of the king's house.  At that time did Hezekiah cut off the gold from the doors of the temple of the LORD, and from the pillars which Hezekiah king of Judah had overlaid, and gave it to the king of Assyria.
American King James Version×). Another important indicator is God’s statement in 2 Kings 20:6 2 Kings 20:6And I will add to your days fifteen years; and I will deliver you and this city out of the hand of the king of Assyria; and I will defend this city for my own sake, and for my servant David's sake.
American King James Version×that He will defend Jerusalem and Hezekiah against the king of Assyria—seeming to indicate Sennacherib’s assault, which would necessitate that it had not yet occurred. Finally, destruction is seen looming over Jerusalem following Hezekiah’s sickness (see 2 Chronicles 32:24-25 2 Chronicles 32:24-25  In those days Hezekiah was sick to the death, and prayed to the LORD: and he spoke to him, and he gave him a sign.  But Hezekiah rendered not again according to the benefit done to him; for his heart was lifted up: therefore there was wrath on him, and on Judah and Jerusalem.
American King James Version×). Therefore, we will proceed on what appears to be the likelier supposition—that Hezekiah became ill prior to Sennacherib’s invasion.
But his sickness must have come right before—earlier in the same year as the invasion. In 2 Kings 18:13 2 Kings 18:13Now in the fourteenth year of king Hezekiah did Sennacherib king of Assyria come up against all the fenced cities of Judah, and took them.
American King James Version×, we are told that Sennacherib (who invaded in 701 B.C.) came in the 14th year of Hezekiah. Thus we understand Hezekiah’s sole reign upon the death of his father to have begun around 715 B.C. Hezekiah’s 29-year reign is reckoned from 715 to 686 B.C. Since Hezekiah’s life is extended 15 years beyond his sickness, this would place his sickness in 701. The Bible says his illness came “in those days” (2 Kings 20:1 2 Kings 20:1In those days was Hezekiah sick to death. And the prophet Isaiah the son of Amoz came to him, and said to him, Thus said the LORD, Set your house in order; for you shall die, and not live.
American King James Version×; 2 Chronicles 32:24 2 Chronicles 32:24In those days Hezekiah was sick to the death, and prayed to the LORD: and he spoke to him, and he gave him a sign.
American King James Version×; Isaiah 38:1 Isaiah 38:1In those days was Hezekiah sick to death. And Isaiah the prophet the son of Amoz came to him, and said to him, Thus said the LORD, Set your house in order: for you shall die, and not live.
American King James Version×)—that is, in the days of Sennacherib’s invasion. And this must have indicated a narrow span of time, as we’ve seen.
Sadly, as faithful as Hezekiah had been, in preparing for war against Assyria, he and his people were not looking to God but to their military capabilities and strategies. Isaiah had stated this very thing in Isaiah 22:8-11 Isaiah 22:8-11  And he discovered the covering of Judah, and you did look in that day to the armor of the house of the forest.
 You have seen also the breaches of the city of David, that they are many: and you gathered together the waters of the lower pool.
 And you have numbered the houses of Jerusalem, and the houses have you broken down to fortify the wall.
 You made also a ditch between the two walls for the water of the old pool: but you have not looked to the maker thereof, neither had respect to him that fashioned it long ago.
American King James Version×, which we read earlier. God, then, allows Hezekiah to fall prey to a deathly illness involving some kind of lesion. Hezekiah thus refocuses on his commitment to God—fervently praying for healing. And God promises to heal him.
It is interesting to note Isaiah’s prescription of a poultice of figs even given God’s promise to heal. “The practice of applying figs to an ulcerated sore is well attested in the records of the ancient Middle East, being mentioned as early as the Ras Shamra (Ugaritic) tablets of the second millennium B.C.” (The Nelson Study Bible, note on Isaiah 20:7 Isaiah 20:7
American King James Version×). This shows that we are to do what we physically can to relieve ourselves of illness in addition to fully relying on God’s healing. In addition to purely supernatural miracles of healing, there are natural laws of health and healing that God created for healing. All healing comes from God—and our working within His laws of health and healing does not betray trust in Him. Even using physical methods such as Isaiah prescribed, it is still God and His laws that do the healing. Thus, God’s promise to heal can include using the systems of the body and is not limited to overt miracles. In Hezekiah’s case, perhaps God supernaturally healed part of Hezekiah’s problem and let natural healing methods alleviate the other part.
We then see the sign of the sundial. This was an incredible miracle. Like the miracle of Joshua’s long day, it involved stopping the earth from turning—and this time rotating it backwards a ways. Consider that the surface of the earth at the equator is moving at a speed of more than 1,000 miles per hour. The laws of inertia demand that if the earth were suddenly stopped, everything on its surface would go flying forward—and massive upheaval would result on land and sea. So God had to have kept everything calm and in place. It is truly staggering to contemplate. Certainly Hezekiah understood it to be a great miracle. But given our scientific knowledge today, we are able to realize the immense complexity of this miracle far more than Hezekiah possibly could have.