Musnad Abu Ya'la al-Mawsili 115:269

Zuhayr narrated to us, Abd al-Rahman ibn Mahdi narrated to us, Imran al-Qattan narrated to us, from Qatadah, from Anas: That the Messenger of Allah (may Allah bless him and grant him peace) appointed Ibn Umm Maktum as his successor over Medina twice. He said: And I indeed saw him on the day of al-Qadisiyyah, and with him was a black banner.