Musnad Abu Ya'la al-Mawsili 42:26

Narrated to us Abdullah ibn Umar ibn Aban, narrated to us Muhammad ibn Fudayl, from Muhammad ibn Ishaq, from Yazid ibn Abdullah ibn Qusayt, from Abu Salamah ibn Abd al-Rahman and Ata ibn Yasar, from Abu Sa’id al-Khudri, who said: The Messenger of Allah (may Allah bless him and grant him peace) distributed different food of dates, so we traded it among ourselves for an increase. The Messenger of Allah (may Allah bless him and grant him peace) forbade us from selling it except measure for measure.