Albert Barnes' Notes on the Whole Bible - Isaiah 10:21
The remnant ... - That is, those who shall be left after the invasion of Sennacherib.Shall return - Shall abandon their idolatrous rites and places of worship, and shall worship the true God.The mighty God - The God that had evinced his power in overcoming and destroying the armies of Sennacherib. read more
The Pulpit Commentary - Isaiah 10:22-23
These verses are exegetical of the term "remnant," and bring out its full force. The promise had been made to Abraham that his seed should be "like the sand of the sea for multitude" ( Genesis 22:17 ). This promise had been fulfilled ( 1 Kings 4:20 ); but now the sins of the people would produce a reversal of it. It would be a remnant, and only a remnant , of the nation that would escape. Judah would have to make a fresh start as from a new beginning (see Ezra 2:64 ). read more