One Piece Chapter 4, page 4-5: Chapter 4: The Great Captain Morgan

Helmeppo bursts into his father's office crying, slamming the door and shouting, "Daddy!! I want you to kill someone for me!!" Morgan looks at his son in annoyance, asking, "What's wrong, Helmeppo? Why the commotion?" Meanwhile, back at the execution ground, Luffy approaches Roronoa Zoro again. Zoro is annoyed, saying, "You again... If this is about me joining your pirate crew, my answer is still no!" Luffy cheerfully replies, "Call me Luffy! I'll untie you if you'll join my pirate crew, okay!?" Zoro sighs, grumbling, "You don't listen, boy!

Zoro explains that he has his own mission and refuses to become a "stinking pirate." Luffy questions if he thinks he's too good to be a pirate, pointing out that everyone already thinks Zoro is a demon bounty hunter. Zoro firmly states, "I live by my own code... I've never done anything I regret, and I don't intend to in the future. I don't care what people think. Which is why I'll never be a pirate!!" Luffy mentions he heard Zoro can use a sword, and Zoro boasts, "Hmph! If I wasn't tied up, I'd show you..." Luffy stubbornly declares, "Sorry, but I've made up my mind! You're gonna join my crew!!" Zoro screams back, "I don't care what you've decided!!