(46) باب إِذَا كَانَ الْبَائِعُ بِالْخِيَارِ، هَلْ يَجُوزُ الْبَيْعُ
Narrated Hakim bin Hizam:
The Prophet (ﷺ) said, "Both the buyer and the seller have the option of canceling or confirming the bargain unless they separate." The sub-narrator, Hammam said, "I found this in my book: 'Both the buyer and the seller give the option of either confirming or canceling the bargain three times, and if they speak the truth and mention the defects, then their bargain will be blessed, and if they tell lies and conceal the defects, they might gain some financial gain but they will deprive their sale of (Allah's) blessings."
Reference: Sahih al-Bukhari 2114
In-book reference: Book 34, Hadith 67
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 327