Hakim ibn Hizam reported: The Prophet, peace and blessings be upon him, said, “Both parties in a business transaction have the right to annul it, as long as they have not separated. If they are truthful and clear with one another, their transaction is blessed. If they lie and conceal something, the blessing of their transaction will be eliminated.”
Source: Ṣaḥīḥ al-Bukhārī 2110, Ṣaḥīḥ Muslim 1532
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ حَكِيمِ بْنِ حِزَامٍ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَتَفَرَّقَا فَإِنْ صَدَقَا وَبَيَّنَا بُورِكَ لَهُمَا فِي بَيْعِهِمَا وَإِنْ كَذَبَا وَكَتَمَا مُحِقَ بَرَكَةُ بَيْعِهِمَا
2110 صحيح البخاري كتاب البيوع باب إذا بين البيعان ولم يكتما ونصحا
1532 صحيح مسلم كتاب البيوع باب الصدق في البيع والبيان