Abu Sa'id al-Khudri · The Chapters on Business Transactions

'The best (most pure) food a man consumes is that which he has earned himself, and his child (and his child's wealth) is part of his earnings."

I heard Jabir bin 'Abdullah say: "In the Year of the Conquest, while he was in Makkah the Messenger of Allah (ﷺ), said: 'Allah and His Messenger have forbidden the sale of wines, meat of dead animals, pigs and 'idols.' It was said to him: 'O Messenger of Allah, what do you think of the fat of dead animals, for it is used to caulk ships, it is daubed on animal skins and people use it to light their lamps?'…

"The Messenger of Allah (ﷺ) forbade. meeting the owners of goods (away from the market)."

"I used to sell dates in the marketplace, and I would say: 'This was such and such an amount (when I bought it).' I Would give the purchaser a specific amount of dates according to the way it had been measured for me, and take my profit. Then I began to have some doubts about that, so I asked the Messenger of Allah (ﷺ), and he said: ‘When you name the amount, measure it in front of the purchaser."'

"The Messenger of Allah (ﷺ) forbade the Muhaqalah and the Muzabanah."

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