Muwatta Malik 1700

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ إِسْحَاقَ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّهُ قَالَ رَأَيْتُ عُمَرَ بْنَ الْخَطَّابِ - وَهُوَ يَوْمَئِذٍ أَمِيرُ الْمُؤْمِنِينَ - يُطْرَحُ لَهُ صَاعٌ مِنْ تَمْرٍ فَيَأْكُلُهُ حَتَّى يَأْكُلَ حَشَفَهَا ‏.‏

Yahya related to me from Malik from Ishaq ibn Abdullah ibn Abi Talha that Anas ibn Malik said, "I saw Umar ibn al-Khattab when he was amir al-muminin being given a sa of dates, and he ate all of them, even the inferior ones

Reference

Muwatta Malik 1700

In-book

Book 49, Hadith 30