One Piece Chapter 6, page 19: Chapter 6: Number One

Helmeppo has taken Koby hostage, holding a pistol directly to his head. He laughs maniacally, "HEH HEH HEH! ONE FALSE MOVE AND FOUR EYES GETS IT!!! IF YOU EVEN BLINK, I'LL SHOOT!" The Marines gasp in shock, whispering, "HELMEPPO...!!" Despite having a gun pointed at his head, Koby bravely yells to Luffy, "HEY, LUFFY!! DON'T LET THEM WIN BECAUSE OF ME! LET HIM KILL ME!!" Hearing this, Luffy smiles warmly and says, "YOU'RE A GOOD GUY, KOBY!"