One Piece Chapter 52, page 15: OATH

With tears and blood streaming down his face, Zoro raises his sword high and screams his solemn vow: "THAT I'M NEVER GOING TO LOSE AGAIN! UNTIL THE DAY I FIGHT HIM AND WIN... TO NEVER LOSE AGAIN! I SWEAR!". Hearing this, Luffy grins widely and shouts back, "I SWEAR!". Mihawk looks on with a satisfied smile, acknowledging the young swordsman's unbreakable spirit.