"Bitter Rivals and Broken Bonds" (見えない亀裂, Mienai Kiretsu) is episode 108 of the original Naruto anime.
As Naruto and Sasuke are about to clash, Kakashi Hatake appears and deflects them into differing water towers. Admiring the damage his attack has done to his water tower, Sasuke believes himself to be stronger than Naruto. After closer inspection, he finds Naruto's tower to be considerably worse off, and only comes to envy Naruto's strength even more. The two teachers, Kakashi and Jiraiya talk about their own rivalry and how it parallels the latter and Orochimaru's relationship. Later, Kakashi has to tie Sasuke up to talk to him and lectures him about not attacking his comrades. While Sasuke only half-listens to Kakashi's words, the arrival of Orochimaru's Sound Four erases Kakashi's message from his mind.