Sunan al-Nasa'i — The Book of Financial Transactions

“When two people meet to engage in trade, the transaction between them is not binding until they separate, unless they have chosen to conclude the transaction.”

The Prophet said: “Do not soak Az-Zahuw and ripe dates, and do not soak ripe dates and raisins together.”

“The Messenger of Allah forbade us to soak two things together when one is more potent than the other. I asked him about Fadikh (a drink made from fresh dates cut open) and he forbade it. He disliked the extra bit on Al-Busr, fearing that that might make it two things, so we used to cut it off.”

“I saw Anas bin Malik when some Busr which had extra bits were brought to him, and he started to cut them off.”