Sulaiman al-A'mash الأعمش / سليمان بن مهران · The Book of Financial Transactions

"The Messenger of Allah said: "The best (most Pure) food that a man eats is that which he has earned himself, and a man's child (and his child's wealth) is part of his earnings" (Sahih )

"The Messenger of Allah said: 'The best (most pure) food that a man eats is that which he has earned himself, and his child (and his child's wealth) is part of his earning."

It was narrated from Sahl bin Abi Hathamah that the Prophet forbade selling fruits before their condition was known, but he granted a concession allowing 'Araya sales by estimate, so its people could eat fresh dates.

"I heard Ibn 'Abbas say: 'As for that which the Messenger of Allah forbade, (it is) selling before taking possession of food."'

the Messenger of Allah prohibited lending on the condition of a sale, or to have two conditions in one transaction, or to profit from what you do not posses.

"The Messenger of Allah caught up with me when I was riding a bad camel of ours, and I said: 'We have a bad camel, mare's the pit! The Prophet said: Will you sell it to me, O Jabir?' I Said, 'No, It is yours, O Messenger of Allah.; He said: 'O Allah forgive him; O Allah, have mercy on him. I will buy it for such and such, and I will lend it to you to ride until (we…

"When the Verses of Riba were revealed, the Messenger of Allah (ﷺ) stood up on the Minbar and recited them to the people, then he forbade dealing in wine."

if a man becomes bankrupt, then a specific item is found with him, and is recognized, then it belongs to the one who sold it to him.