Isaiah 41:8-10 KJV - 8 But thou, Israel, [art] my servant, Jacob whom I have chosen, the seed of Abraham my friend. 9 [Thou] whom I have taken from the ends of the earth, and called thee from the chief men thereof, and said unto thee, Thou [art] my servant; I have chosen thee, and not cast thee away. 10 Fear thou not; for I [am] with thee: be not dismayed; for I [am] thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
Israel is the servant of God, and the elect of God:
Isaiah 45:4 KJV - 4 For Jacob my servant's sake, and Israel mine elect, I have even called thee by thy name: I have surnamed thee, though thou hast not known me.
Jesus is also God's servant and God's elect:
Isaiah 42:1 KJV - 1 Behold my servant, whom I uphold; mine elect, [in whom] my soul delighteth; I have put my spirit upon him: he shall bring forth judgment to the Gentiles.
Isaiah 49:3, 5-6 KJV - 3 And said unto me, Thou [art] my servant, O Israel, in whom I will be glorified. ... 5 And now, saith the LORD that formed me from the womb [to be] his servant, to bring Jacob again to him, Though Israel be not gathered, yet shall I be glorious in the eyes of the LORD, and my God shall be my strength. 6 And he said, It is a light thing that thou shouldest be my servant to raise up the tribes of Jacob, and to restore the preserved of Israel: I will also give thee for a light to the Gentiles, that thou mayest be my salvation unto the end of the earth.