Naruto Episode 40
Kakashi threatens to kill Orochimaru, a threat that Orochimaru takes lightly. Despite this, Orochimaru leaves, with Kakashi terrified at his foolishness. Meanwhile, Shino and Zaku Abumi continue their match, with Shino ultimately winning his match through the use of his destruction bugs, leaving Kankuro and Misumi Tsurugi to fight next.
Source: Wikipedia
Naruto Episode 40 – Kakashi and Orochimaru: Face-to-Face!
