Imam Maalik مالك بن أنس بن مالك بن أبي عامر · Commercial Transactions (Kitab Al-Buyu)

"He (the Prophet) purchased a calf from a caravan, but he had no money with him. He then sold it with some profit and gave the profit in charity to the poor and widows of Banu 'Abd al-Muttalib. He then said: I shall not buy anything after this but only when I have money with me.

The Messenger of Allah (ﷺ) as saying: Delay in payment (of debt) by a rich man is injunctive, but when one of you is referred to a wealthy man, he should accept the reference.

The Prophet (ﷺ) owed me a debt and gave me something extra when he paid it.

The Prophet (ﷺ) bought a slave for two slaves.

The Messenger of Allah (ﷺ) forbade the sale of fruits for dried dates, but gave license regarding the 'araya for its sale on the basis of a calculation of their amount. But those who buy them can eat them when fresh.

'Araya means that a man lends another man some palm-trees, but he (the owner) feels inconvenient that the man looks after the trees (by frequent visits). He (the borrower) sells them (to the owner) by calculation.

The tradition mentioned above has also been transmitted by Abu Said al-Khudri through a different chain of narrators from the Messenger of Allah (ﷺ) to the same effect as narrated by both Sufyan and 'Abd al-Razzaq.

I asked Rafi' b. Khadij about the lease of land for gold and silver (i.e. for dinars and dirhams). There is no harm in it, for the people used to let out land in the time of the Messenger of Allah (ﷺ) for what grew by the current of water and at the banks of streamlets and at the places of cultivation. So sometimes this (portion) perished and that (portion) was saved, and sometimes this remained intact and that perished.…