A Lesson Learned: The Iron Fist of Love!

is episode 153 of the original Naruto anime.

Synopsis
Out to try and save Rorusuke, Naruto and the others ambush members of the Kurosuki Family and save an old man. They soon hear the funeral bell and go and save Rorusuke. However, Rock Lee meets an old friend among the group, and Lee must now convince Karashi to return to his old way of life. Their time together is cut short, as Raiga watches from the sidelines. Naruto and his team pursue Raiga into a thick fog, and find that Raiga is able to conceal himself from even the Byakugan.