Hadith 2844
وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنِ ابْتَاعَ طَعَامًا فَلَا يَبِيعهُ حَتَّى يَسْتَوْفِيه»
He reported God's Messenger as saying, “If anyone buys grain he must not sell it till he has received it in full.”