Sunan Ibn Majah, Book 7, Hadith 1826 (In-Book) ⓘ
It was narrated that Anas bin Malik said: “The Prophet would not go out on the Day of Fitr until he had eaten some dates.”
حَدَّثَنَا جُبَارَةُ بْنُ الْمُغَلِّسِ، حَدَّثَنَا هُشَيْمٌ، عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ النَّبِيُّ ـ صلى الله عليه وسلم ـ لاَ يَخْرُجُ يَوْمَ الْفِطْرِ حَتَّى يَطْعَمَ تَمَرَاتٍ .
also referenced under: Hadith 1754 (Reference) & Volume 2, Book 7, Hadith 1754 (DarusSalam)