Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrated that the Messenger of Allah (peace and blessings be upon him) said: Two people involved in a transaction have the option (to cancel the sale) as long as they do not separate, unless they both stipulate the condition of choice.
Hadith Referenceمسند عبدالله بن عمر / 79
Hadith Gradingمحدثین:صحیح
Hadith Takhrij«صحيح بخاري، البيوع، باب كم يجوز الخيار، رقم الحديث: 2107، صحيح مسلم، البيوع، باب ثبوت خيار المجلس للمتبايعين، رقم الحديث: 1531»