Abdullah bin Muslima al-Qa'nabi عبد الله بن مسلمة بن قعنب القعنبي · Commercial Transactions (Kitab Al-Buyu)

"Lying and swearing have a place on i." 'Abd Allah al-Zuhri said: "Unprofitable speech and lying."

"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.