Allah's Messenger (ﷺ) never proceeded (for the prayer) on the Day of `Id-ul-Fitr unless he had eaten some dates. Anas also narrated: The Prophet (ﷺ) used to eat odd number of dates.
Sahih al-Bukhari Book 13, Hadith 5
← Previous Hadith Abu Bakr came to my house while two small Ansari girls were singing beside me the stories of the Ansar concerning the Day of Buath. And they were not singers. Abu Bakr said protestingly, "Musical instruments of Satan in the house of Allah's Messenger (ﷺ) !" It happened on the `Id day and Allah's Messenger (ﷺ) said, "O Abu Bakr! There is an `Id for every nation and this is our `Id."

Sahih al-Bukhari Book 13, Hadith 4 Next Hadith → The Prophet (ﷺ) said, "Whoever slaughtered (his sacrifice) before the `Id prayer, should slaughter again." A man stood up and said, "This is the day on which one has desire for meat," and he mentioned something about his neighbors. It seemed that the Prophet (ﷺ) I believed him. Then the same man added, "I have a young she-goat which is dearer to me than the meat of two sheep." The Prophet (ﷺ) permitted him to slaughter it as a sacrifice. I do not know whether that permission was valid only for him or for others as well.

Sahih al-Bukhari Book 13, Hadith 6