Sunan an-Nasa'i Book 48, Hadith 25
"Ibn Mas'ud addressed us and said: 'How do you want me to recite? According to the recitation of Zaid bin Thabit, when I learned seventy-odd Surahs from the mouth of the Messenger of Allah while Zaid was with the other boys with two braids?'"
"According to whose recitation do you want me to recite? Because I recited seventy-odd Surahs to the Messenger of Allah when Zaid had two braids, and was playing with the other boys."
"When he came to the Prophet said to him: 'Come closer to me.' So he came closer to him, and he put his hand on his braid and wiped his head and prayed for him."