Who is this 'remnant,' and why is prayer specifically called for on their behalf?
The 'remnant' in this context refers to the people of Judah and Jerusalem who have not yet been conquered by the Assyrian army. Many cities have fallen, and the enemy's threats are aimed at the heart of the nation's hope.
Isaiah is being told to pray not just for general deliverance, but specifically for those who are left—a small, vulnerable group facing overwhelming odds. The enemy's goal is to annihilate God's people and His covenant promises. Prayer, then, becomes a direct act of standing with and defending this fragile remnant.
It underscores that our prayers are not abstract; they are deeply connected to the survival and well-being of God's people, especially in times of severe testing.