حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ الْقَعْنَبِيُّ حَدَّثَنَا مَالِکٌ ح و حَدَّثَنَا يَحْيَی بْنُ يَحْيَی قَالَ قَرَأْتُ عَلَی مَالِکٍ عَنْ نَافِعٍ عَنْ ابْنِ عُمَرَ أَنَّ رَسُولَ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ مَنْ ابْتَاعَ طَعَامًا فَلَا يَبِعْهُ حَتَّی يَسْتَوْفِيَهُ
صحیح مسلم · Hadith 3840
Ibn Abbas (Allah be pleased with them) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: He who buys foodgrain should not sell it, until he has weighed it (and then taken possession of it). I (Tawus) said to Ibn Abbas (Allah be pleased with them): Why is it so? Thereupon he said: Don't you see that they (the people) sell foodgrains against gold for the stipulated time. Abu Kuraib did not make any mention of the stipulated time.
Sanad
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ الْقَعْنَبِيُّ حَدَّثَنَا مَالِکٌ ح و حَدَّثَنَا يَحْيَی بْنُ يَحْيَی قَالَ قَرَأْتُ عَلَی مَالِکٍ عَنْ نَافِعٍ عَنْ ابْنِ عُمَرَ