Muhammad bin Ajlan al-Madni محمد بن عجلان المدني · The Book of Financial Transactions

"I heard Nafi narrating from Ibn 'Umar, form the Messenger of Allah 'the two parties to a transaction both have the choice so long as they have not separated unless they have chosen to conclude the transaction. " Nafi said: ''When 'Abdullah bought something he like, he would leave straightaway."

"We were sitting with the Messenger of Allah when he raised his head toward the sky, and put his palm on his forehead, then he said: 'Subhan Allah, what a stern warning has been revealed! We fell silent and were scared. The following day I asked him: 'O Messenger of Allah, what is this stern warning that has been revealed? He said: 'By the One in Whose hand is my soul, if a man were to be killed in the…