Musannaf Ibn Abi Shayba 3:5121

Abu Bakr narrated to us, he said: Waki' narrated to us, he said: Sufyan narrated to us, from Yahya ibn Hani' ibn 'Urwah al-Muradi, from 'Abd al-Hamid ibn Mahmud, who said: We prayed behind one of the commanders, and the people crowded until we prayed between two pillars. When we finished praying, Anas ibn Malik said: "We used to avoid this during the time of the Messenger of Allah, may Allah bless him and grant him peace."