Muwatta Malik 1699

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 ibn al-Khattab was eating bread with ghee. He summoned one of the desert people and he began to eat and follow the grease in the dish with a morsel of bread. Umar said, "It is as if you were poor." He said, "By Allah. 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 butter until people are given life again like they were first given life," (i.e. on the Day of Rising)

Reference

Muwatta Malik 1699

In-book

Book 49, Hadith 29