Sayyiduna Anas bin Malik (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) would go out for Eid al-Fitr after eating dates, and he would eat the dates in an odd number.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6154