صحيح مسلم
Sahih Muslim
كتاب البيوع
The Book of Transactions
باب تَحْرِيمِ بَيْعِ الرَّجُلِ عَلَى بَيْعِ أَخِيهِ وَسَوْمِهِ عَلَى سَوْمِهِ وَتَحْرِيمِ النَّجْشِ وَتَحْرِيمِ التَّصْرِيَةِ:
Chapter: The prohibition of urging a buyer to cancel a purchase in order to sell him one's own goods; And urging a seller to cancel a sale already agreed upon so that one can buy the goods oneself; And the prohibition of artificially inflating prices; And the prohibition of letting milk accumulate in the udder in order to deceive the purchaser
Hadith 1412
This hadith is listed as number 3812 in Maktaba Shamila
حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ ، وَمُحَمَّدُ بْنُ الْمُثَنَّى ، وَاللَّفْظُ لِزُهَيْرٍ ، قَالَا : حَدَّثَنَا يَحْيَي ، عَنْ عُبَيْدِ اللَّهِ ، أَخْبَرَنِي نَافِعٌ ، عَنْ ابْنِ عُمَرَ ، عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، قَالَ : " لَا يَبِعِ الرَّجُلُ عَلَى بَيْعِ أَخِيهِ ، وَلَا يَخْطُبْ عَلَى خِطْبَةِ أَخِيهِ إِلَّا أَنْ يَأْذَنَ لَهُ " .
Ibn 'Umar (RA) reported Allah's Messenger (ﷺ) as saying: A person should not enter into a transaction when his brother is already making a transaction and he should not make a proposal of marriage when his brother has already made a proposal except when lie gives permission.
