Full Sharh — Sunan an-Nasa'i 4467
أَخْبَرَنَا مُحَمَّدُ بْنُ عَلِيٍّ الْمَرْوَزِيُّ، قَالَ حَدَّثَنَا مُحْرِزُ بْنُ الْوَضَّاحِ، عَنْ إِسْمَاعِيلَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الْمُتَبَايِعَانِ بِالْخِيَارِ مَا لَمْ يَفْتَرِقَا إِلاَّ أَنْ يَكُونَ الْبَيْعُ كَانَ عَنْ خِيَارٍ فَإِنْ كَانَ الْبَيْعُ عَنْ خِيَارٍ فَقَدْ وَجَبَ الْبَيْعُ " .
English Translation
it was narrated from Ismail, from Nafi, that Ibn 'Umar said:"The Messenger of Allah said: 'The two parties to a transaction both have the choice so long as they have not separated, unless they have both chosen to conclude they transaction. If they have both chosen to conclude the transaction, then the transaction is binding." (Sahih)
Source
Sunan an-Nasa'i(سنن النسائي)
The Book of Financial Transactions
Hadith Number
4467
Grade
Sahih