Ibn Ishaq محمد بن إسحاق بن يسار‎ · The Chapters on Business Transactions

'Whoever achieves at something, let him stick with It.'"

"I heard Abu Saeed Al-Khudri say: 'A Dirham for a Dirham and a Dinar for a Dinar.' So I said: 'I heard Ibn 'Abbas say something other than that.' He said: 'But I met Ibn 'Abbas and said: "Tell me about what you say concerning exchange is it something that you heard from the Messenger of Allah (ﷺ) or something that You found in the Book of Allah?" He said: "I did not find it in the Book of Allah,…

"There is nothing wrong with selling animals, one for two, hand to hand," but he disliked selling them on credit.

"I heard 'Irbad bin Sariyah say: 'I was with the Prophet (ﷺ) and a Bedouin said: "Pay me back for my young camel, and he gave him an older (i.e., better) camel." He said: 'O Messenger of Allah! It is older (i.e., better) than my camel.' The Messenger of Allah (ﷺ) said: 'The best of people are those who are best in repaying."'