The Book of Transactions
21/10. Chapter:
Affirming that both parties to a transaction have the option (of canceling it) while they are still together
Sahih Muslim
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " الْبَيِّعَانِ كُلُّ وَاحِدٍ مِنْهُمَا بِالْخِيَارِ عَلَى صَاحِبِهِ مَا لَمْ يَتَفَرَّقَا إِلاَّ بَيْعَ الْخِيَارِ " .
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 1531aIn-book reference : Book 21, Hadith 52USC-MSA web (English) reference : Book 10, Hadith 3656