Sunan An-Nasa'i - سنن النسائي
44. The Book of Financial Transactions - كتاب البيوع
20) Chapter: Urging Someone to Cancel A Sale He Has already Agreed Upon So As To Sell Him Your Own Goods
It was narrated from Ibn 'Umar that the Prophet said:
"No one of you should urge someone to cancel a sale he has already agreed upon with his brother so as to sell him his won goods.'
20) باب بَيْعِ الرَّجُلِ عَلَى بَيْعِ أَخِيهِ
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكٍ، وَاللَّيْثِ، - وَاللَّفْظُ لَهُ - عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ . " لاَ يَبِيعُ أَحَدُكُمْ عَلَى بَيْعِ أَخِيهِ "