Ibn ʿUmar told us that the people used to buy food from the caravans in the lifetime of the Prophet. The Prophet ﷺ used to forbid them to sell it at the very place where they had purchased it (but they were to wait) till they carried it to the market where foodstuff was sold. Ibn ʿUmar said, 'The Prophet ﷺ also forbade the reselling of foodstuff by somebody who had bought it unless he had received it with exact full measure.'  

حَدَّثَنَا ابْنُ عُمَرَ أَنَّهُمْ كَانُوا يَشْتَرُونَ الطَّعَامَ مِنَ الرُّكْبَانِ عَلَى عَهْدِ النَّبِيِّ ﷺ فَيَبْعَثُ عَلَيْهِمْ مَنْ يَمْنَعُهُمْ أَنْ يَبِيعُوهُ حَيْثُ اشْتَرَوْهُ حَتَّى يَنْقُلُوهُ حَيْثُ يُبَاعُ الطَّعَامُ قَالَ وَحَدَّثَنَا ابْنُ عُمَرَ ؓ قَالَ نَهَى النَّبِيُّ ﷺ أَنْ يُبَاعَ الطَّعَامُ إِذَا اشْتَرَاهُ حَتَّى يَسْتَوْفِيَهُ