صحیح مسلم · Hadith 3817

Abu Huraira (Allah be pleased with him) reported that Allah's Messenger ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) forbade the (people) meeting the caravan (for entering into business transaction with them), and the selling of goods by a townsman on behalf of a man of the desert, and seeking by a woman the divorce of her sister (from her husband), and outbidding (against one another), and tying up the udders (of animals), and buying of (things) in opposition to one's brother.