Sufyan bin 'Uyaynah سفيان بن عيينة · Commercial Transactions (Kitab Al-Buyu)

In the time of the Messenger of Allah (ﷺ) we used to be called brokers, but the Prophet (ﷺ) came upon us one day, and called us by a better name than that, saying: O company of merchants, unprofitable speech and swearing takes place in business dealings, so mix it with sadaqah (alms).

The Prophet (ﷺ) gave license for the sale of 'araya for dried dates and fresh dates.

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 Prophet (ﷺ) forbade the type of sale which involves risk (or uncertainty) and a transaction determined by throwing stones.