حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ سُلَيْمَانَ بْنَ يَسَارٍ، قَالَ فَنِيَ عَلَفُ حِمَارِ سَعْدِ بْنِ أَبِي وَقَّاصٍ فَقَالَ لِغُلاَمِهِ خُذْ مِنْ حِنْطَةِ أَهْلِكَ فَابْتَعْ بِهَا شَعِيرًا وَلاَ تَأْخُذْ إِلاَّ مِثْلَهُ ‏.‏

Yahya related to me from Malik that he had heard that Sulaymanibn Yasar said, "The fodder of the donkeys of Saad ibn Abi Waqqas ranout and so he told his slave to take some of the family's wheat andbuy barley with it, and to only take a like quantity." Translation Not Available

Book Ref: Muwatta Imam Malik Book 31 Hadith 1343
Web Ref:  Muwatta Imam Malik Book 31 Hadith 50