(42) باب كَمْ يَجُوزُ الْخِيَارُ
Narrated Ibn `Umar:
The Prophet (ﷺ) said, "The buyer and the seller have the option to cancel or confirm the bargain before they separate from each other or if the sale is optional." Nafi` said, "Ibn `Umar used to separate quickly from the seller if he had bought a thing which he liked."
Reference: Sahih al-Bukhari 2107
In-book reference: Book 34, Hadith 60
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 320