أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا أَبُو مُعَاوِيَةَ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ يَبِيعُ الرَّجُلُ عَلَى بَيْعِ أَخِيهِ حَتَّى يَبْتَاعَ أَوْ يَذَرَ " .
It was narrated from Ibn 'Umar that the Messenger of Allah said: "Do not urge someone to cancel a sale he has already agreed upon so as to sell him your own goods, unless he bys or changes his mind." Translation Not Available
Book Ref: Sunan An Nisai Book 44 Hadith 4504
Web Ref: Sunan An Nisai Vol 5 Book 44 Hadith 4508