Musannaf Ibn Abi Shayba 3:6360

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Al-A’mash narrated to us, from Talha ibn Musarrif, from Abd al-Rahman ibn Awsaja, from al-Bara’ ibn Azib, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Adorn the Quran with your voices."