Musnad Ahmad 1511

It was narrated that "Abdullah bin ar-Ruqaim al-Kinani said: We went out to Madinah at the time of the Battle of the Camel, and we met Sa’d bin Malik there, who said: “The Messenger of Allah (ﷺ) instructed us to shut the gates that led from the houses into the mosque, but to leave the gate of "Ali (رضي الله عنه).”