Asim narrates from Sayyiduna Amr bin Salamah (may Allah be pleased with him) that when my people returned from the Prophet (peace and blessings be upon him), he (peace and blessings be upon him) had said: "Let the one among you who has read the most Qur'an lead you in prayer." He says: They called me and taught me bowing and prostration. I would lead them in prayer while I was a boy, and I had a torn sheet on me, so they would say to my father: "Will you not cover your son's backside from us?"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5138