(10) باب ثُبُوتِ خِيَارِ الْمَجْلِسِ لِلْمُتَبَايِعَيْنِ
Ibn 'Umar (Allah be pleased with them) reported Allah's Messenger (ﷺ) as saying:
Both parties in a business transaction have the right to annul it so long as they have not separated; except in transactions which have been made subject to the right of parties to annul them.
Reference: Sahih Muslim 1531 a
In-book reference: Book 21, Hadith 52
USC-MSA web (English) reference(deprecated numbering scheme): Book 10, Hadith 3656