Umm Habibah bint Abi Sufyan · The Chapters on Business Transactions

"When the Prophet (ﷺ) came (to Al-Madinah), they used to pay in advance for dates, two or three years in advance. He said: 'Whoever pays in advance for dates, let him pay for a known amount or a known weight, to be delivered at a known time.’”

"A man came to the Prophet (ﷺ) and said, 'The tribe of Banu so-and- so, who were descended from the Jews, have become Muslim, and they are starving, and I am afraid that they may apostatize.' The Prophet (ﷺ) said: 'Who has something with him?' A Jewish man said: 'I have such and such, and he named it, and I think he said three hundred Dinar for such and such 'an amount (of produce) from the garden of the tribe…