سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 4466
The Book of Financial Transactions
Mentioning the Differneces Reported From Nafi
أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، قَالَ حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ الْبَيِّعَانِ بِالْخِيَارِ مَا لَمْ يَفْتَرِقَا أَوْ يَكُونَ خِيَارًا .
It was narrated from Yahaya, from 'Ubaidullah who said: "Nafi narrated to me from Ibn 'Umar, tht the Messenger of Allah said: 'the two parties to a transaction both have the choice so long as they have not separated, or they have chosen." (Sahih )
Sunan an-Nasa'i, 4466