Sunan Abi Dawud Book 2, Hadith 195

The one of you who knows most of the Qur’an should act as your imam. I knew the Qur’an better than most of them because I had memorized it. They, therefore, put me in front of them, and I would lead them in prayer. I wore a small yellow mantle which, when I prostrated myself, went up on me, and a woman of the clan said: Cover the back side of your leader from us. So they bought an ‘Ammani shirt for me, and I have never been so pleased about anything after embracing Islam as I was about that (shirt). I used to lead them in prayer and I was only seven or eight year old.