Bulugh al-Maram 7 Business Transactions كتاب البيوع 34

وَعَنْهُ قَالَ: { نَهَى رَسُولُ اَللَّهِ – صلى الله عليه وسلم -أَنْ يَبِيعَ حَاضِرٌ لِبَادٍ, وَلَا تَنَاجَشُوا, وَلَا يَبِيعُ اَلرَّجُلُ عَلَى بَيْعِ أَخِيهِ, وَلَا يَخْطُبُ عَلَى خِطْبَةِ أَخِيهِ, وَلَا تُسْأَلُ اَلْمَرْأَةُ طَلَاقَ أُخْتِهَا لِتَكْفَأَ مَا فِي إِنَائِهَا } مُتَّفَقٌ عَلَيْهِ 1 . 1 – صحيح. رواه البخاري ( 2140 )، ومسلم ( 1515 )، واللفظ للبخاري.

Narrated [Abu Hurairah (RA)]: Allah’s Messenger (صلى الله عليه وسلم) forbade, a city-dweller to sell for a man from the desert; one to bid against another (to raise the price); that someone sell (his product) by canceling the sale of his brother; to propose (marriage) to a woman after his brother has done so; or a woman to ask to have her sister divorced in order to deprive her of what belongs to her. [Agreed upon].