Sunan Ibn Majah 2171
It was narrated from Ibn 'Umar that the Messenger of Allah ﷺ said:
"Let one of you not undersell another."[1]
حَدَّثَنَا سُوَيْدُ بْنُ سَعِيدٍ، حَدَّثَنَا مَالِكُ بْنُ أَنَسٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ ـ ﷺ ـ قَالَ " لاَ يَبِيعُ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ " .
Classification
Sahih (Authentic) [Darussalam]
References
Sunan Ibn Majah 2171
Sunan Ibn Majah Vol. 3, Book of Business Transactions, Hadith 2171