It was narrated from Samurah that the Messenger of Allah ﷺ 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 ﷺ ـ " الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَتَفَرَّقَا " .