Muwatta Malik #1391
Business Transactions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، . أَنَّ حَكِيمَ بْنَ حِزَامٍ، ابْتَاعَ طَعَامًا أَمَرَ بِهِ عُمَرُ بْنُ الْخَطَّابِ لِلنَّاسِ فَبَاعَ حَكِيمٌ الطَّعَامَ قَبْلَ أَنْ يَسْتَوْفِيَهُ فَبَلَغَ ذَلِكَ عُمَرَ بْنَ الْخَطَّابِ فَرَدَّهُ عَلَيْهِ وَقَالَ لاَ تَبِعْ طَعَامًا ابْتَعْتَهُ حَتَّى تَسْتَوْفِيَهُ .
Yahya related to me from Malik from Nafi that Hakim ibn Hizam
traded in food for people as Umar ibn al-Khattab had ordered him to
do. Hakim re-sold the food before he had taken delivery of it. That
reached Umar ibn al-Khattab and he revoked the sale and said, "Do not
sell food which you have purchased until you take delivery of it."
About Muwatta Malik
This hadith is #1391 from Muwatta Malik, in the Book of Business Transactions.