وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ سَمِعَ جَمِيلَ بْنَ عَبْدِ الرَّحْمَنِ الْمُؤَذِّنَ، يَقُولُ لِسَعِيدِ بْنِ الْمُسَيَّبِ إِنِّي رَجُلٌ أَبْتَاعُ مِنَ الأَرْزَاقِ الَّتِي تُعْطَى النَّاسُ بِالْجَارِ مَا شَاءَ اللَّهُ ثُمَّ أُرِيدُ أَنْ أَبِيعَ الطَّعَامَ الْمَضْمُونَ عَلَىَّ إِلَى أَجَلٍ ‏.‏ فَقَالَ لَهُ سَعِيدٌ أَتُرِيدُ أَنْ تُوَفِّيَهُمْ مِنْ تِلْكَ الأَرْزَاقِ الَّتِي ابْتَعْتَ فَقَالَ نَعَمْ ‏.‏ فَنَهَاهُ عَنْ ذَلِكَ ‏.‏ قَالَ مَالِكٌ الأَمْرُ الْمُجْتَمَعُ عَلَيْهِ عِنْدَنَا الَّذِي لاَ اخْتِلاَفَ فِيهِ أَنَّهُ مَنِ اشْتَرَى طَعَامًا بُرًّا أَوْ شَعِيرًا أَوْ سُلْتًا أَوْ ذُرَةً أَوْ دُخْنًا أَوْ شَيْئًا مِنَ الْحُبُوبِ الْقِطْنِيَّةِ أَوْ شَيْئًا مِمَّا يُشْبِهُ الْقِطْنِيَّةَ مِمَّا تَجِبُ فِيهِ الزَّكَاةُ أَوْ شَيْئًا مِنَ الأُدْمِ كُلِّهَا الزَّيْتِ وَالسَّمْنِ وَالْعَسَلِ وَالْخَلِّ وَالْجُبْنِ وَالشَّبْرَقِ وَاللَّبَنِ وَمَا أَشْبَهَ ذَلِكَ مِنَ الأُدْمِ فَإِنَّ الْمُبْتَاعَ لاَ يَبِيعُ شَيْئًا مِنْ ذَلِكَ حَتَّى يَقْبِضَهُ وَيَسْتَوْفِيَهُ ‏.‏

Yahya related to me from Malik that Yahya ibn Said heard Jamilibn Abd ar-Rahman the Muadhdhin say to Said ibn al-Musayyab, "I am aman who buys whatever Allah wills of the receipts for the provisionswhich people are offered at al-Jar. I want to take payment for goodsthat I guarantee to deliver at a future date." Said said to him, "Doyou intend to settle these things with receipts for provisions youhave bought?" He said, "Yes." So he forbade that. Malik said,"The generally agreed on way of doing things among us in which thereis no dispute, about buying food - wheat, barley, durra-sorghum, pearlmillet, or any pulse or anything resembling pulses on which zakat isobliged, or condiments of any sort - oil, ghee, honey, vinegar,cheese, sesame oil, milk and so on, is that the buyer should not re-sell any of that until he has taken possession and complete deliveryof it. Translation Not Available

Book Ref: Muwatta Imam Malik Book 31 Hadith 1338
Web Ref:  Muwatta Imam Malik Book 31 Hadith 46