Musnad Abu Ya'la al-Mawsili 112:18

Muhammad ibn 'Abbad al-Makki and Hatim ibn Isma'il narrated to us, [who] narrated to us from Sharik, from al-A'mash, from Yazid ibn Aban, from al-Hasan, from Anas, that the Prophet, may Allah bless him and grant him peace, said: "Indeed, the Qur'an is a wealth after which there is no poverty, and there is no wealth besides it."