Sunan Ibn Majah, Volume 3, Book 12, Hadith 2183 (DarusSalam) ⓘ
It was narrated from Samurah that the Messenger of Allah said: "The two parties to a transaction have the choice (of annulling it) so long as they have not yet parted. "
حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، وَإِسْحَاقُ بْنُ مَنْصُورٍ، قَالاَ حَدَّثَنَا عَبْدُ الصَّمَدِ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، عَنِ الْحَسَنِ، عَنْ سَمُرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَتَفَرَّقَا " .
also referenced under: Hadith 2183 (Reference) & Book 12, Hadith 2267 (In-Book)