Musnad Abu Ya'la al-Mawsili 65:1

Khalaf al-Bazzaz narrated to us, Hammad bin Zayd narrated to us, from Abu Imran, from Jundub bin Abdullah al-Bajali—and I do not know him to attribute it except to the Prophet, may God bless him and grant him peace—who said: "Recite the Quran as long as your hearts are in agreement over it. But if you differ regarding it, then stand up and leave it." He said: "And I was, during the time of the Messenger of God, may God bless him and grant him peace, a young boy of age."