سُنَنُ ابْنِ مَاجَهْ
Sunan Ibn Majah 2171
The Chapters on Business Transactions
“A Man Is Not To Undersell The Sale Of His Brother, Nor Is He To Try To Out-Haggle His B
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]
Sunan Ibn Majah, 2171Sahih (Darussalam)