Mishkat al-Masabih
Mishkat al-Masabih 2851
Business Transactions which are Forbidden - Section 1
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَا يَسُمِ الرَّجُلُ على سَوْمِ أخيهِ الْمُسلم» . رَوَاهُ مُسلم
Translation
Abu Huraira reported God’s Messenger as saying, “A man must not offer a price above that offered by his brother Muslim.” Muslim transmitted it.