وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، كَانَ يَأْكُلُ خُبْزًا بِسَمْنٍ فَدَعَا رَجُلاً مِنْ أَهْلِ الْبَادِيَةِ فَجَعَلَ يَأْكُلُ وَيَتَّبِعُ بِاللُّقْمَةِ وَضَرَ الصَّحْفَةِ فَقَالَ عُمَرُ كَأَنَّكَ مُقْفِرٌ ‏.‏ فَقَالَ وَاللَّهِ مَا أَكَلْتُ سَمْنًا وَلاَ رَأَيْتُ أَكْلاً بِهِ مُنْذُ كَذَا وَكَذَا ‏.‏ فَقَالَ عُمَرُ لاَ آكُلُ السَّمْنَ حَتَّى يَحْيَا النَّاسُ مِنْ أَوَّلِ مَا يَحْيَوْنَ ‏.‏

Yahya related to me from Malik from Yahya ibn Said that Umar ibnal-Khattab was eating bread with ghee. He summoned one of the desertpeople and he began to eat and follow the grease in the dish with amorsel of bread. Umar said, "It is as if you were poor." He said, "ByAllah. I have not eaten ghee nor have I seen food with it since such-and-such a time." Umar declared, "I shall not eat clarified butteruntil people are given life again like they were first given life,"(i.e. on the Day of Rising.) Translation Not Available

Book Ref: Muwatta Imam Malik Book 49 Hadith 1702
Web Ref:  Muwatta Imam Malik Book 49 Hadith 29