Musannaf Ibn Abi Shayba 3:3682

Abu Bakr narrated to us, he said: Abu Usama narrated to us, he said: Mujalid informed us, from al-Sha'bi, who said: The Messenger of Allah (peace be upon him) went out to Badr, and he appointed Ibn Umm Maktum as a successor over Medina. He used to lead them in prayer, and he was blind.