(8) باب وُجُوبِ الْخِيَارِ لِلْمُتَبَايِعَيْنِ قَبْلَ افْتِرَاقِهِمَا
It was narrated that Hakim bin Hizam said:
The Messenger of Allah said: "The two parties to a transaction have the choice so long as they have not separated. If they are honest and open, their transaction will be blessed, but if they tell lies and conceal anything the blessing of their transaction will be lost."
Reference: Sunan an-Nasa'i 4464
In-book reference: Book 44, Hadith 16
English translation: Vol. 5, Book 44, Hadith 4469