(9) باب ذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ فِي لَفْظِ حَدِيثِهِ
It was narrated from Ayyub, from Nafi from Ibn 'Umar, who said:
"The Messenger of Allah said: 'The two parties to a transaction both have the choice so long as they have not separated or chosen to conclude the transaction." Or perhaps Nafi said: "Or one of them has said to the other: 'Decide! "(Sahih )
Reference: Sunan an-Nasa'i 4470
In-book reference: Book 44, Hadith 22
English translation: Vol. 5, Book 44, Hadith 4475