Isaiah 49:3-6

and he said unto me, Thou art my servant; Israel, in whom I will be glorified. But I said, I have labored in vain, I have spent my strength for nought and vanity; yet surely the justice due to me is with Jehovah, and my recompense with my God. And now saith Jehovah that formed me from the womb to be his servant, to bring Jacob again to him, and that Israel be gathered unto him (for I am honorable in the eyes of Jehovah, and my God is become my strength); yea, he saith, It is too light a 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.