And I will deliver thee and this city out of the hand of the king of Assyria: and I will defend this city.
In 2 Kings 20:8, after this verse comes the statement as to the means and the sign of his cure, which is put at the end, in order not to interrupt God's message (Isaiah 38:21-22) by Isaiah (Isaiah 38:5-8).
I will deliver thee and this city. The city was already delivered, but here assurance is given, that Hezekiah shall have no more to fear from the Assyrians.