Musannaf Ibn Abi Shayba 3:5683

Muhammad ibn Bishr narrated to us, he said: Abdullah ibn Amr narrated to us, he said: Ibrahim ibn Abdullah ibn Hunayn narrated to me, from his father, he said: I heard Ali at the Rahbah of Kufa saying: The Messenger of Allah, may Allah bless him and grant him peace, forbade me from reciting the Quran while I am bowing.