كتاب الزهد والرقائق
55  
The Book of Zuhd and Softening of Hearts
Sahih Muslim 2978

Simak b. Barb reported:

I heard Nu'man deliver an address in which he said that (Hadrat) Umar made a mention of what had fallen to the lot of people out of the material world and he said: I saw Allah's Messenger (ﷺ) spend the whole day being upset because of hunger and he could not get even an interior quality of dates with which he could fill his belly.
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا مُحَمَّدُ، بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ، عَنْ سِمَاكِ بْنِ حَرْبٍ، قَالَ سَمِعْتُ النُّعْمَانَ، يَخْطُبُ قَالَ ذَكَرَ عُمَرُ مَا أَصَابَ النَّاسُ مِنَ الدُّنْيَا فَقَالَ لَقَدْ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَظَلُّ الْيَوْمَ يَلْتَوِي مَا يَجِدُ دَقَلاً يَمْلأُ بِهِ بَطْنَهُ ‏.‏
Reference : Sahih Muslim 2978
In-book reference : Book 55, Hadith 45
USC-MSA web (English) reference : Book 42, Hadith 7101
  (deprecated numbering scheme)