Avatar: The Last Airbender, Season 3

[Aang, in the Avatar State, has immobilized Ozai in stone restraints]

Aang and all his past lives:
[in the Avatar State] FIRE LORD OZAI. YOU AND YOUR FOREFATHERS HAVE DEVASTATED THE BALANCE OF THIS WORLD. AND NOW, YOU SHALL PAY THE ULTIMATE PRICE!

[Aang prepares to deliver the final blow using all four elements. Ozai closed his eyes, but Aang leaves the Avatar State and the elements fall apart at the last minute and Ozai's restraints crumble as Aang lowers himself to the ground.

Aang:
No. I'm not going to end it like this.

Ozai:
[sneering] Even with all the power in the world, you are still weak.

[Ozai tries to attak Aang from behind, but Aang senses his attack through vibrations in the ground. Restraining Ozai's arms with Earthbending again, he places his hands on Ozai's chest and forehead.]

Lion Turtle:
[in flashback] In the era before the Avatar, we bent not the elements, but the energy within ourselves. To bend another's energy, your own spirit must be unbendable... or else you will be corrupted and destroyed.

[Aang's mouth and eyes glow blue, which spreads across his body. Ozai's eyes and mouth glow orange and do the same. At first, Ozai's energy nearly overwhelms Aang, but then Aang's energy stabilizes and overcomes Ozai's energy completely. Aang releases Ozai, who tries to attack him again, but simply staggers weakly to his knees.]

Ozai:
What...what did you do to me?

Aang:
I took away your Firebending. You can't use it to hurt or threaten anyone else ever again.