One Piece Chapter 48, page 3-4: GIVE UP ON THAT SEA

Don Krieg continues explaining the origin of Zeff's nickname: "YOUR NICKNAME 'RED-LEG' REFERS TO YOUR LEGS, THAT WOULD BE DYED IN THE BLOOD OF YOUR ENEMIES AFTER A FIGHT." He notes that despite rumors of Zeff dying in a shipwreck, he survived at the cost of one of his legs, concluding, "WITH ONE OF YOUR LEGS GONE, YOU SHOULDN'T BE ABLE TO FIGHT ANYMORE." Sanji listens silently. Zeff raises his hands and replies, "I MAY NOT BE ABLE TO FIGHT ANYMORE BUT I CAN STILL COOK AS LONG AS I HAVE THESE HANDS. BUT JUST WHAT ARE YOU GETTING AT EXACTLY?

Don Krieg reveals his true objective: "RED-LEG ZEFF, YOU'RE A MAN WHO ONCE BRAVED THE WATERS OF THE DEVIL'S HIDEOUT, THE GRAND LINE ITSELF! NOT ONLY THAT, YOU RETURNED WITHOUT INJURY. YOU MUST'VE KEPT A LOG DURING YOUR TIME IN GRAND LINE. SO WHAT I'M GETTING AT IS... HAND OVER THAT LOG TO ME!" Luffy is amazed, asking, "COOL, YOU'VE BEEN TO GRAND LINE, OLD MAN?" Zeff confirms he kept a log and still has it, but firmly refuses: "BUT I SHAN'T HAND THAT OVER TO YOU. THAT LOG IS THE PRIDE OF ME AND MY MEN WHO BRAVELY VENTURED GRAND LINE TOGETHER. IT'S MUCH TOO VALUABLE TO GIVE TO THE LIKES OF YOU!