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.
وَعَنْ أَبِي هُرَيْرَةَ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ لَا تَلَقَّوا اَلْجَلَبَ، فَمَنْ تُلُقِّيَ فَاشْتُرِيَ مِنْهُ, فَإِذَا أَتَى سَيِّدُهُ اَلسُّوقَ فَهُوَ بِالْخِيَارِ } . رَوَاهُ مُسْلِمٌ 1 .1 - صحيح. رواه مسلم ( 1519 ). والجلب: هو ما يجلب للبيع و " سيده " هو مالك المجلوب، ومعناه إذا جاء صاحب المتاع إلى السوق، وعرف السعر، فله الخيار في الاسترداد.
Narrated Narrated Abu Hurairah (RA):
Allah's Messenger (ﷺ) said: "Do not go out to meet what is being brought (to market for sale). Whoever has done so and bought some of it, when its owner comes to the market he has the choice (of canceling the deal)."
وَلِمُسْلِمٍ: { لَا يَسُمِ اَلْمُسْلِمُ عَلَى سَوْمِ اَلْمُسْلِمِ } 1 .1 - مسلم ( 1515 ) ( 9 ) إلا أن الذي فيه: " على سوم أخيه " بدل: " على سوم المسلم ".
Narrated Muslim has:
"A Muslim must not offer a price above that offered by another Muslim."
Narrated Narrated Tawus from Ibn 'Abbas (RA), Allah's Messenger (ﷺ) said:
"Do not go out to meet riders (to conduct business with them), and a city-dweller must not sell for a man from the desert." I asked Ibn 'Abbas (RA), "What did he mean by 'A city-dweller must not sell for a man from the desert.'" He replied, "He should not act as a broker for him."