Musnad Abu Ya'la al-Mawsili 150:322

Abu Hisham al-Rifa'i narrated to us, Yahya ibn Yaman narrated to us, Sufyan narrated to us, from Habib ibn Abi Thabit, from Maymun ibn Abi Shabib, from Aisha, who said: The Messenger of Allah, peace and blessings of Allah be upon him, commanded us to place people in their [appropriate] ranks.