Sayyiduna Abdullah (may Allah be pleased with him) said: "I recited seventy surahs before the Messenger of Allah (peace and blessings be upon him), and I completed the Qur'an with the best of people, Ali bin Abi Talib (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8414