عَنْ أَبِي بَرْزَةَ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَتَفَرَّقَا
It is narrated from Sayyiduna Abu Barzah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: The two persons involved in a transaction have the option (to cancel the sale) as long as they do not separate.