حَدَّثَنَا عَبْدُ اللہُ حَدَّثَنَا مُصْعَبٌ حَدَّثَنَا مَالِكٌ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنْ النَّجْشِ مِثْلَهُ
مسند امام احمد بن حنبل · Hadith 5863
It was narrated from Ibn 'Umar that the Messenger of Allah (PBUH) said: "Do not undersell one another." And he forbade artificially inflating prices, and he forbade selling habl al-habalah and he forbade muzaabanah. Muzaabanah refers to selling fresh dates (on the tree) for dried dates by measure, and selling grapes (on the vine) for raisins by measure.
Sanad
حَدَّثَنَا عَبْدُ اللہُ حَدَّثَنَا مُصْعَبٌ حَدَّثَنَا مَالِكٌ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ