Isaiah 49:4-5
4
But I said, "I have labored in vain, I have spent my strength for nothing and vanity; yet surely the justice [due] to me is with Yahweh, and my reward with my God."
5
Now says Yahweh who formed me from the womb to be his servant, to bring Jacob again to him, and that Israel be gathered to him (for I am honorable in the eyes of Yahweh, and my God is become my strength);