Yahya related to me from Malik from Nafi that Hakim ibn Hizam traded in food for people as Umar ibn al-Khattab had ordered him to do. Hakim re-sold the food before he had taken delivery of it. That reached Umar ibn al-Khattab and he revoked the sale and said, "Do not sell food which you have purchased until you take delivery of it."
Muwatta Malik Book 31, Hadith 43
← Previous Hadith Yahya related to me from Malik from Nafi that Abdullah ibn Umar said, "In the time of the Messenger of Allah, may Allah bless him and grant him peace, we used to buy food. He sent orders for us to move our purchases from the place in which we purchased them to another place before we re-sold them."

Muwatta Malik Book 31, Hadith 42 Next Hadith → Yahya related to me from Malik that he had heard that receipts were given to people in the time of Marwan ibn al-Hakam for the produce of the market at al-Jar. People bought and sold the receipts among themselves before they took delivery of the goods. Zayd Thabit and one of the Companions of the Messenger of Allah, may Allah bless him and grant him peace, went to Marwan ibn al-Hakam and said, "Marwan! Do you make usury halal?" He said, "I seek refuge with Allah! What is that?" He said, "These receipts which people buy and sell before they take delivery of the goods." Marwan therefore sent a guard to follow them and to take them from people's hands and return them to their owners.

Muwatta Malik Book 31, Hadith 44