Hadith 4504
Chapter 20: Urging Someone to Cancel A Sale He Has already Agreed Upon So As To Sell Him Your Own Goods - كتاب البيوع
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."
Reference : Sunan an-Nasa'i 4504
In-book reference : Book 44, Hadith 56