«البيعان بالخيار ما لم يتفرقا إلا أن تكون صفقة خيار ولا يحل له أن يفارق صاحبة خشية أن يستقيله»
The Prophet (peace and blessings be upon him) said:
"The buyer and the seller have the option (to cancel the sale) as long as they have not separated from each other, unless the transaction is made with a stipulated option, and it is not lawful for anyone to part from his counterpart out of fear that he may cancel the transaction."
Hadith Referenceصحیح الجامع الصغیر / حرف الباء / 2894