Sunan an-Nasa'i 4607
سنن النسائي#4607Sahihأَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ عَبْدِ اللَّهِ بْنِ عَبْدِ الْحَكَمِ، قَالَ حَدَّثَنَا شُعَيْبُ بْنُ اللَّيْثِ، عَنْ أَبِيهِ، عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، حَدَّثَهُمْ أَنَّهُمْ، كَانُوا يَبْتَاعُونَ الطَّعَامَ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم مِنَ الرُّكْبَانِ فَنَهَاهُمْ أَنْ يَبِيعُوا فِي مَكَانِهِمُ الَّذِي ابْتَاعُوا فِيهِ حَتَّى يَنْقُلُوهُ إِلَى سُوقِ الطَّعَامِ .
It was narrated from Nafi that Ibn 'UMar told them, that:they used to buy foold from the riders at the time of the Messenger of Allah and he forbade them to sell it in the place where they had bought it until they moved it to the food market
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 44:159