Crossing the Limits…!! (限界を超えて…!!, Genkai o Koete…!!) is chapter 128 of the Naruto manga.
The pain caused by Chidori only increases Gaara's interest in the battle. After advancing his transformation further he attacks Sasuke again, this time even faster than before. Knowing Chidori is the only way to damage Gaara, Sasuke remembers what Kakashi told him about the jutsu: that his limit is two uses per day and, if he tried to exceed that, he would die. Having already used Chidori twice and knowing he will die anyway if he doesn't try, Sasuke uses a third Chidori, activating the cursed seal to give him the needed strength. While the attack succeeds, Sasuke is unable to move afterwards. Gaara quickly recovers and moves to finish Sasuke, but is stopped by Naruto.