The Bounty Hunter from the Wilderness

is episode 159 of the original Naruto anime.

Synopsis
Naruto, Hinata and Kiba accept what they believe will be an easy mission to catch a criminal. Upon arriving at the thief's last known location, however, they learn that another bounty hunter, Sazanami, is pursuing the thief and he's a skilled swordsman. Sazanami is wounded in the battle, and Naruto's group take him to safety, but discover that he, too, is a wanted criminal when a bounty hunter tried to catch him.