Sahih al-Bukhari 2079
Narrated Hakim bin Hizam:
Allah's Messenger (ﷺ) said, "The seller and the buyer have the right to keep or return goods as long as they 
have not parted or till they part; and if both the parties spoke the truth and described the defects and 
qualities (of the goods), then they would be blessed in their transaction, and if they told lies or hid 
something, then the blessings of their transaction would be lost."
حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنْ صَالِحٍ أَبِي الْخَلِيلِ، عَنْ عَبْدِ اللَّهِ بْنِ الْحَارِثِ، رَفَعَهُ إِلَى حَكِيمِ بْنِ حِزَامٍ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَتَفَرَّقَا ـ أَوْ قَالَ حَتَّى يَتَفَرَّقَا ـ فَإِنْ صَدَقَا وَبَيَّنَا بُورِكَ لَهُمَا فِي بَيْعِهِمَا، وَإِنْ كَتَمَا وَكَذَبَا مُحِقَتْ بَرَكَةُ بَيْعِهِمَا ‏"‏‏.‏