Hadith 2171
Chapter 13: “A Man Is Not To Undersell The Sale Of His Brother, Nor Is He To Try To Out-Haggle His B - كتاب التجارات
حَدَّثَنَا سُوَيْدُ بْنُ سَعِيدٍ، حَدَّثَنَا مَالِكُ بْنُ أَنَسٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ " لاَ يَبِيعُ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ " .
It was narrated from Ibn 'Umar that the Messenger of Allah (ﷺ) said:
"Let one of you not undersell another."[1]
Reference : Sunan Ibn Majah 2171
In-book reference : Book 12, Hadith 35