Musannaf Ibn Abi Shayba 22:347

Mu'adh ibn Mu'adh narrated to us, from 'Awf, from Mikhraq, from Abu Kinana, from Abu Musa al-Ash'ari, who said: "Part of the glorification of Allah is honoring the bearer of the Qur'an, who neither exaggerates regarding it nor neglects it."