Arabic (Original)
حَدَّثَنَا يَحْيَى عَنْ عُبَيْدِ اللَّهِ أَخْبَرَنِي نَافِعٌ عَنِ ابْنِ عُمَرَ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ كُلُّ بَيِّعَيْنِ فَأَحَدُهُمَا عَلَى صَاحِبِهِ بِالْخِيَارِ حَتَّى يَتَفَرَّقَا أَوْ يَكُونَ خِيَارًا.
English Translation
Yahya told us, from Ubaydullah: Nafi' informed me, from Ibn Umar, from the Prophet, peace and blessings be upon him, who said, "Each of the two parties to a sale has the option to cancel against his companion as long as they have not separated, or unless there is an option agreed upon."