Brothers: Distance Among the Uchiha

is episode 129 of the original Naruto anime.

Synopsis
Naruto rises from the flames unharmed, and Sasuke begins to remember his childhood and his reasons for becoming obsessed with power. Sasuke's childhood was spent living in his brother, Itachi's, shadow. Being the prodigy of the clan, Itachi received all the attention from their father, leaving Sasuke to live his life trying to earn his father's recognition. Itachi, aware of Sasuke's efforts, did what he could to redirect some of their father's attention to Sasuke, but saw little success. In time, the members of the Uchiha clan began to suspect Itachi of being a murderer, and Itachi started openly attacking and disrespecting the clan.