Sahih al-Bukhari 2727

Muhammad ibn ʿArʿara narrated to us; Shuʿba narrated to us, from ʿAdi ibn Thabit, from Abu Hazim, from Abu Hurayra (may Allah be pleased with him), who said: The Messenger of Allah forbade meeting trading caravans before they reach the market, a migrant buying on behalf of a Bedouin, a woman stipulating that her prospective husband divorce his other wife, a man bidding over his brother’s bid, artificial price inflation, and concealing an animal’s milk to deceive a buyer.

Muʿadh and ʿAbd al-Samad also narrated it from Shuʿba. Gundar and ʿAbd al-Rahman said, “It was forbidden.” Adam said, “We were forbidden.” Al-Nadr and Hajjaj ibn Minhal said, “He forbade.”