Zayd ibn Thabit · The Book of Financial Transactions

the Messenger of Allah forbade selling fruits before they ripen. It was said: "O Messenger of Allah what does ripen mean?" he said: 'when they turn red." And the Messenger of Allah said: "What do you think if Allah withholds the fruits (causes it not to ripen), why would any one of you take his brother's wealth?"

"The Messenger of Allah said: "If you sell fruits to your brother then the crop fails, it is not permissible for you it takes anything from him. Why would you take the wealth of your brother unlawfully?"'

"Whoever sells fruit then his crop fails, he should not take (anything) from his brother." (And he said something along the lines of) "Why would anyone of you consume the wealth of his Muslim brother?"

the Prophet annulled transaction in the event of crop faioure.

"At the time of the Messenger of Allah, a ma suffered loss of some fruit that he had purchased, and his debts increased. The Messenger of Allah said: 'give him charity.' So the people gave him charity, but that was not enough to pay of his debts. The Messenger of Allah said: "Take what you find but you have no right to or than that.""