For the nations; all nations, Jews and Gentiles, who shall then embrace the true faith and the Messiah, as was said, Isaiah 11:10. The outcasts; that were driven and banished out of their own land into foreign parts, as the word implies. Of Israel; strictly so called, or of the ten tribes, as is manifest, both from their opposition to Judah in this verse, and from the mention of Ephraim in the next verse.
Related Commentaries of Isaiah 11:12
Isaiah 11:12
12 And he shall set up an ensign for the nations, and shall assemble the outcasts of Israel, and gather together the dispersed of Judah from the four cornersc of the earth.