Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bukhari:2108Ḥafṣ b. ʿUmar > Hammām > Qatādah > Abū al-Khalīl > ʿAbdullāh b. al-Ḥārith > Ḥakīm b. Ḥizām

The Prophet ﷺ said, "The buyer and the seller have the option of canceling or confirming the deal unless they separate."  

البخاري:٢١٠٨حَدَّثَنَا حَفْصُ بْنُ عُمَرَ حَدَّثَنَا هَمَّامٌ عَنْ قَتَادَةَ عَنْ أَبِي الْخَلِيلِ عَنْ عَبْدِ اللَّهِ بْنِ الْحَارِثِ عَنْ حَكِيمِ بْنِ حِزَامٍ ؓ

عَنِ النَّبِيِّ ﷺ قَالَ الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَفْتَرِقَا وَزَادَ أَحْمَدُ حَدَّثَنَا بَهْزٌ قَالَ قَالَ هَمَّامٌ فَذَكَرْتُ ذَلِكَ لأَبِي التَّيَّاحِ فَقَالَ كُنْتُ مَعَ أَبِي الْخَلِيلِ لَمَّا حَدَّثَهُ عَبْدُ اللَّهِ بْنُ الْحَارِثِ بِهَذَا الْحَدِيثِ