Musannaf Ibn Abi Shaybah 6254 — A slave leading the prayer

Abdullah bin Ubaydullah bin Abi Mulaykah says: My father, Ubayd bin Umayr, Sayyiduna al-Miswar bin Makhramah (may Allah be pleased with him) and many other people used to come to Sayyidah Aishah (may Allah be pleased with her). Abu Amr, a freed slave of Sayyidah Aishah (may Allah be pleased with her), used to lead them in prayer. Abu Amr was still a slave at that time and had not yet been freed.