Charles Ellicott Commentary 2 Kings 19:4

"It may be Jehovah thy God will hear all the words of Rabshakeh, whom the king of Assyria his master hath sent to defy the living God, and will rebuke the words which Jehovah thy God hath heard: wherefore lift up thy prayer for the remnant that is left." — 2 Kings 19:4 (ASV)

It may be. —The old commentator Clericus well remarks: “Non est dubitantis sed sperantis.”

And will reprove the words. —See Note on 2 Kings 19:3. The Septuagint and Vulgate read, “and to rebuke with the words which the Lord,” etc., but the Syriac and Targum agree with the Authorised Version as regards the construction.

Lift up. —Heavenwards (2 Chronicles 32:2). Or we might compare the phrase “to lift up the voice” (Genesis 27:38), and render, “to utter” (Numbers 23:7).

Thy prayer. — A prayer.

The remnant that are left. — The existing (or, present) remnant. Sennacherib had captured most of the strong cities of Judah, and the daughter of Zion was left as a hut in a vineyard (Isaiah 1:8). (Compare to Note on 2 Chronicles 32:1).