It was narrated from Ibn 'Umar that the Prophet ﷺ 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.'

أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكٍ، وَاللَّيْثِ، - وَاللَّفْظُ لَهُ - عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ " لاَ يَبِيعُ أَحَدُكُمْ عَلَى بَيْعِ أَخِيهِ " .