Musannaf Ibn Abi Shayba 3:3234

Hatim ibn Isma'il narrated to us, from 'Abd al-Rahman ibn Harmalah, that he used to depart with Sa'id ibn al-Musayyib from the morning [prayer] when the Imam would say the taslim on the day of 'Eid, until he would reach the prayer ground (musalla) near the house of Kathir ibn al-Salt. Then he would sit by the two door leaves.