Yahya bin Saeed (may Allah have mercy on him) narrates that I mentioned to Qasim bin Muhammad (may Allah have mercy on him) a transaction that we used to do for the sake of an orphan who was under my care. We would make a deal for food and oil for a fixed period and a known price. After the deal was settled, the man would go and bring the required food and oil, and he would deliver the full amount as agreed. Qasim (may Allah have mercy on him) said, "We did not see any harm in this transaction until the governor of Madinah forbade it. So, when the governor has forbidden it, I do not like to do this transaction."
Hadith Referenceالسنن المأثورة / باب أيام التشريق / 392
Hadith Takhrijهذا مقطوع و اسناده الى القاسم صحيح على شرط الشيخين۔