Musannaf Ibn Abi Shayba 22:25

Ja'far ibn Ghiyath and Waki' narrated to us, from al-A'mash, from Talha, from 'Abd al-Rahman ibn 'Awsajah, from al-Bara' ibn 'Azib, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Adorn the Quran with your voices."