Musannaf Ibn Abi Shayba 3:5317

Abu Bakr ibn Ayyash narrated to us, he said: I asked Ata’, "Did Ali use to lead them in prayer during Ramadan?" He said: "The best of Ali’s companions, such as Zadhan, Abu al-Bakhtari, and others, would call their families and lead them in prayer in the mosque during Ramadan."