Esias 45:15

15 For thou art God, yet we knew not, the God of Israel, the Saviour.

Esias 45:15 In-Context

13 I have raised him up a king with righteousness, and all his ways are right: he shall build my city, and shall turn the captivity of my people, not for ransoms, nor for rewards, saith the Lord of hosts.
14 Thus saith the Lord of hosts, Egypt has laboured ; and the merchandise of the Ethiopians, and the Sabeans, men of stature, shall pass over to thee, and shall be thy servants; and they shall follow after thee bound in fetters, and shall pass over to thee, and shall do obeisance to thee, and make supplication to thee: because God is in thee; and there is no God beside thee, .
15 For thou art God, yet we knew not, the God of Israel, the Saviour.
16 All that are opposed to him shall be ashamed and confounded, and shall walk in shame: ye isles, keep a feast to me.
17 Israel is saved by the Lord with an everlasting salvation: they shall not be ashamed nor confounded for evermore.

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