Musannaf Ibn Abi Shayba 13:2526

Abu Bakr narrated to us, he said: Ibn Numayr narrated to us, he said: Muhammad ibn Ishaq narrated to us, from Yazid ibn Abdullah ibn Qusayt, from Ata ibn Yasar, from Abu Sa’id, he said: The Messenger of Allah, may Allah bless him and grant him peace, distributed among us food consisting of dates, some of which were better than others. We went to trade them among ourselves, so the Messenger of Allah, may Allah bless him and grant him peace, forbade us from that, unless it was measure for measure.