“Behold, My Servant, whom I uphold; My chosen one in whom My soul delights. I have put My Spirit upon Him; He will bring forth justice to the nations. (Isaiah 42:1)
This is the first of four Servant-songs referring to Messiah.
My servant. Others deserve the title “my servant” but this personal Servant of the Lord is the Messiah, who was chosen because the Lord delights in him and puts his Spirit upon him.
Justice to the nations. At his second coming, Christ will rule over a kingdom in which justice prevails throughout the world. The millennial kingdom is not for Israel alone, though the Messiah will reign on the throne of David in Jerusalem, and Israel will be the glorious people. In fact, all the nations of the world will experience the righteousness and justice of the Messiah King.
Commentary from John MacArthur