Sunnah.com reference : Book 7, Hadith 34English translation : Book 7, Hadith 812Arabic reference : Book 7, Hadith 809
Narrated [Abu Hurairah (RA)]:
Allah's Messenger (ﷺ) 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].
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.‏