Esias 43:10

10 Be ye my witnesses, and I a witness, saith the Lord God, and my servant whom I have chosen: that ye may know, and believe, and understand that I am : before me there was no other God, and after me there shall be none.

Esias 43:10 In-Context

8 and I have brought forth the blind people; for eyes are alike blind, and they that have ears are deaf.
9 All the nations are gathered together, and princes shall be gathered out of them: who will declare these things? or who will declare to you things from the beginning? let them bring forth their witnesses, and be justified; and let them hear, and declare the truth.
10 Be ye my witnesses, and I a witness, saith the Lord God, and my servant whom I have chosen: that ye may know, and believe, and understand that I am : before me there was no other God, and after me there shall be none.
11 I am God; and beside me there is no Saviour.
12 I have declared, and have saved; I have reproached, and there was no strange among you: ye are my witnesses, and I am the Lord God,

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