Ahmad bin Hanbal أحمد بن حنبل · Commercial Transactions (Kitab Al-Buyu)

I heard my father say: A man said to Shu'bah: Sufyan opposed you (i.e. narrated a tradition which differs from your version). He replied: You racked my mind. I have been told that Yahya b. Ma'in said: If anyone opposes Sufyan, the version of Sufyan will be acceptable.

The Messenger of Allah (ﷺ) borrowed a young camel, and when the camels of the sadaqah (alms) came to him, he ordered me to pay the man his young camel. I said: I find only an excellent camel in its seventh year. So the Prophet (ﷺ) said: Give it to him, for the best person is he who discharges his debt in the best manner.

The Prophet (ﷺ) forbade the sale of fruits till they were clearly in good condition , and (ordered that) they should not be sold but for dinar or dirham except Araya.

The Messenger of Allah (ﷺ) forbade the transaction called habal al-habalah.

The Prophet (ﷺ) said: If anyone sows in other people's land without their permission, he has no right to any of the crop, but he may have what it cost him.

The Messenger of Allah (ﷺ) forbade mukhabarah. I asked: What is mukhabarah ? He replied: That you have the land (for cultivation) for half, a third, or a quarter (of the produce).

When Allah bestowed Khaybar on His Prophet (ﷺ) as fay' (as a result of conquest without fighting), the Messenger of Allah (ﷺ) allowed (them) to remain there as they were before, and apportioned it between him and them. He then sent Abdullah ibn Rawahah who assessed (the amount of dates) upon them.