What does the Bible say about Hezekiah's illness?

In Isaiah 38, we read the account of King Hezekiah who becomes gravely ill and is told by the prophet Isaiah that he will not recover. In response to this dire news, Hezekiah turns to God in prayer, reminding Him of his faithful walk and weeping for mercy. God hears his prayer and sends Isaiah back with a message of healing, promising to extend Hezekiah's life by fifteen years and protecting Jerusalem from Assyria. This narrative highlights God's sovereignty, mercy, and the power of prayer in the life of a faithful servant.