Aqil bin Khalid bin 'Aqil عقيل بن خالد بن عقيل الأيلي · The Chapters on Business Transactions

"The Messenger of Allah (ﷺ) said: 'There are three things in which there is blessing: A sale with deferred payment; Muqaradhah (profit sharing); and mixing wheat with barley for one's house, but not for sale."'