2 Kings 20:5

Turn again, and tell Hezekiah the captain of my people, Thus saith the LORD, the God of David thy father, I have heard thy prayer, I have seen thy tears: behold, I will heal thee: on the third day thou shalt go up unto the house of the LORD.

Thus saith ... the God of David thy father. An immediate answer was given to his prayer, containing an assurance that the Lord was mindful of His promise to David, and would accomplish it in Hezekiah's experience, both by the prolongation of his life and his deliverance from the Assyrians.

On the third day. The perfect recovery from a dangerous sickness, within so short a time, shows the miraculous character of the cure (see his thanksgiving song, Isaiah 38:9). The disease cannot be ascertained; but the text gives no hint that the plague was raking then in Jerusalem; and although Arabian as well as Persian (Morier) physicians apply a cataplasm of figs to plague-boils, they also do so in other cases, as figs are considered useful in ripening and soothing inflammatory ulcers.