Esias 49:3

3 and said to me, Thou art my servant, O Israel, and in thee I will be glorified.

Esias 49:3 In-Context

1 Hearken to me, ye islands; and attend, ye Gentiles; after a long time it shall come to pass, saith the Lord: from my mother's womb he has called my name:
2 and he has made my mouth as a sharp sword, and he has hid me under the shadow of his hand; he has made me as a choice shaft, and he has hid me in his quiver;
3 and said to me, Thou art my servant, O Israel, and in thee I will be glorified.
4 Then I said, I have laboured in vain, I have given my strength for vanity and for nothing: therefore is my judgment with the Lord, and my labour before my God.
5 And now, thus saith the Lord that formed me from the womb to be his own servant, to gather Jacob to him and Israel. I shall be gathered and glorified before the Lord, and my God shall be my strength.

The Brenton translation of the Septuagint is in the public domain.