Charles Spurgeon Commentary Isaiah 14:29

"Rejoice not, O Philistia, all of thee, because the rod that smote thee is broken; for out of the serpent`s root shall come forth an adder, and his fruit shall be a fiery flying serpent." — Isaiah 14:29 (ASV)

Ahaz was defeated, but Hezekiah was raised up to be the leader of the LORD's people.