Ezekiel 39:7, 28

“I will make My holy name known in the midst of My people Israel, and I will not let them profane My holy name anymore; and the nations will know that I am the LORD, the Holy One of Israel.

Then they will know [without any doubt] that I am the LORD their God because I made them go into exile among the nations, and then gathered them to their own land. I will leave none of them there [among the nations] any longer.