Muhammad bin 'AR bin Thauban محمد بن عبد الرحمن بن ثوبان · The Book on Business

"I asked Messenger of Allah (ﷺ), I said: 'A man came to me asking to buy something that I did not have. Can I buy it from the market for him and then give it to him?' He said: 'Do not sell what is not with you.'" He said: There are narrations on this topic from 'Abdullah bin 'Umar.

"The Messenger of Allah (ﷺ) prohibited sales of Al-Munabadhah and Al-Mulamasah." He said: There are narrations on this topic from Abu Sa'eed and Ibn 'Umar. The Hadith is Abu Hurairah is a Hasan Sahih Hadith. And the meaning of (Munabadhah) in this Hadith is when it is said: "When I throw something to you then the sale between you and I is concluded." And Al-Mulamasah is that he says: "When you touch something then the sale is concluded." Even if…