One Piece Chapter 5.3, page 15: The Pirate King and the Great Swordsman

The next day, Zoro learns that Kuina died from falling down the stairs. Devastated, Zoro begs Koushirou to give him Kuina's sword, the Wado Ichimonji. Holding the blade, Zoro tearfully vows to become so famous that his name will reach the heavens.