The Sunnahs that the Muslim should observe on the day of Eid are as follows:
1 – Doing ghusl before going out to the prayer.
It was narrated in a saheeh hadeeth in al-Muwatta' and elsewhere that 'Abd-Allaah ibn 'Umar used to do ghusl on the day of al-Fitr before going out to the prayer-place in the morning. Al-Muwatta' 428.
Al- Nawawi (may Allaah have mercy on him) said that the Muslims were unanimously agreed that it is mustahabb to do ghusl for Eid prayer.
The reason why it is mustahabb is the same reason as that for doing ghusl before Jumu'ah and other public gatherings. Rather on Eid the reason is even stronger.
2 – Eating before going out to pray on Eid al-Fitr and after the prayer on Eid al-Adha:
Part of the etiquette is not to go out to pray on Eid al-Fitr until one has eaten some dates, because of the hadeeth narrated by al-Bukhaari from Anas ibn Maalik, who said that the Messenger of Allaah (peace and blessings of Allaah be upon him) used not to go out on the morning of Eid al-Fitr until he had eaten some dates... of which he would eat an odd number. Al-Bukhaari, 953.
It is mustahabb to eat before going out to emphasize the fact that it is forbidden to fast on that day and to demonstrate that the fast has ended.
Ibn Hajar (may Allaah have mercy on him) suggested that the reason for that was so as to ward off the possibility of adding to the fast, and to hasten to obey the command of Allaah. Al-Fath, 2/446
Whoever does not have any dates may break his fast with anything that is permissible.
But on Eid al-Adha it is mustahabb not to eat anything until one comes back from the prayer, so he should eat from the udhiyah if he has offered a sacrifice. If he is not going to offer a sacrifice there is nothing wrong with eating before the prayer.
3 – Takbeer on the day of Eid
This is one of the greatest Sunnahs on the day of Eid because Allaah says (interpretation of the meaning):
"(He wants that you) must complete the same number (of days), and that you must magnify Allaah [i.e. to say Takbeer (Allaahu Akbar: Allaah is the Most Great)] for having guided you so that you may be grateful to Him"
[al-Baqarah 2:185]
It was narrated that al-Waleed ibn Muslim said: I asked al-Awzaa'i and Maalik ibn Anas about saying Takbeer out loud on the two Eids. They said, Yes, 'Abd-Allaah ibn 'Umar used to say it out loud on the day of al-Fitr until the imam came out (to lead the prayers).
It was narrated in a saheeh report that 'Abd al-Rahmaan al-Sulami said, "They emphasized it more on the day of al-Fitr than the day of al-Adha.". Wakee' said, this refers to the takbeer. See Irwa' al-Ghaleel, 3/122/
Al-Daaraqutni and others narrated that on the morning of Eid al-Fitr and Eid al-Adha, Ibn 'Umar would strive hard in reciting takbeer until he came to the prayer place, then he would recite takbeer until the imam came out.
Ibn Abi Shaybah narrated with a saheeh isnaad that al-Zuhri said: The people used to recite Takbeer on Eid when they came out of their houses until they came to the prayer place, and until the imam came out. When the imam came out they fell silent, and when he said takbeer they said takbeer. See Irwa' al-Ghaleel, 1/121
Saying takbeer when coming out of one's house to the prayer place and until the imam came out was something that was well known among the salaf (early generations). This has been narrated by a number of scholars such as Ibn Abi Shaybah, 'Abd a l-Razzaaq and al-Firyaabi in Ahkaam al-Eidayn from a group of the salaf. For example, Naafi' ibn Jubayr used to recite takbeer and was astonished that the people did not do so, and he said, "Why do you not recite takbeer?"
