Esias 45:5

5 For I am the Lord God, and there is no other God beside me; I strengthened thee, and thou hast not known me.

Esias 45:5 In-Context

3 And I will give thee the treasures of darkness, I will open to thee hidden, unseen , that thou mayest know that I, the Lord thy God, that call thee by name, am the God of Israel.
4 For the sake of my servant Jacob, and Israel mine elect, I will call thee by thy name, and accept thee: but thou hast not known me.
5 For I am the Lord God, and there is no other God beside me; I strengthened thee, and thou hast not known me.
6 That they that from the east and they that from the west may know that there is no God but me. I am the Lord God, and there is none beside.
7 I am he that prepared light, and formed darkness; who make peace, and create evil; I am the Lord God, that does all these things.

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