Musannaf Ibn Abi Shayba 3:5348

Abu Dawud narrated to us, from Shu'bah, from Ash'ath ibn Abi al-Sha'tha', who said: I witnessed Makkah during the time of Ibn al-Zubayr in Ramadan, and the Imam was praying with a group separately, and the people were praying in the corners of the mosque.