John Gill Commentary 2 Chronicles 32:24

"In those days Hezekiah was sick even unto death: and he prayed unto Jehovah; and he spake unto him, and gave him a sign." — 2 Chronicles 32:24 (ASV)

In those days Hezekiah was sick
Of which sickness, and of his prayer, and of the sign given him, see (Isaiah 38:1–22) and the notes there.