A Lesson Learned: The Iron Fist of Love!

is episode 153 of the original Naruto anime.

Synopsis
Determined to try and save Rorusuke, Naruto and the others ambushed some members of the Kurosuki Family and managed to rescue an old man. They then heard the funeral bell, and went to try and save Rorusuke. However, Rock Lee met an old friend among the group. Lee tried to convince Karashi to return to his old way of life, but to no avail. Their time together was cut short, however, as Raiga was watching from the sidelines. Naruto and his team pursued Raiga into a thick fog, and found that Raiga was able to conceal himself from even the Byakugan.