Charles Ellicott Commentary 2 Kings 19:31

"For out of Jerusalem shall go forth a remnant, and out of mount Zion they that shall escape: the zeal of Jehovah shall perform this." — 2 Kings 19:31 (ASV)

A remnant. —Isaiah’s favourite doctrine of the remnant (Isaiah 4:2–3; Isaiah 10:20–21).

Those who escape. —A survival.

Out of Jerusalem. —The ravaged land was to be newly stocked from there.

The zeal (jealousy) of the Lord of hosts shall do this. —Another of the phrases of Isaiah. (See Isaiah 10:7.) (The word hosts, missing from the common Hebrew text, is found in many manuscripts, and all the versions.)