Jezekiel 39:28

28 And they shall know that I am the Lord their God, when I have been manifested to them among the nations.

Jezekiel 39:28 In-Context

26 And they shall bear their reproach, and the iniquity which they committed when they dwelt upon their land in peace. Yet there shall be none to terrify
27 when I have brought them back from the nations, and gathered them out of the countries of the nations: and I will be sanctified among them in the presence of the nations.
28 And they shall know that I am the Lord their God, when I have been manifested to them among the nations.
29 And I will no more turn away my face from them, because I have poured out my wrath upon the house of Israel, saith the Lord God.

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