Beginning from the Fajr of the 9th Zulhijjah up to the 'Asr prayer of the 13th, it is obligatory on each Muslim to recite the Takbir of Tashriq after every fard prayer in the following words.
"Allaahu akbar, Allaahu akbar, la ilaaha ill-Allaah; wa Allaahu akbar wa Lillaahi'l-hamd (Allaah is Most Great, Allaah is Most Great, there is no god but Allaah; Allaah is Most Great and to Allaah be praise)…"
The Prophet (r) commanded us to recite a lot of Tasbeeh ("Subhan-Allaah"), Tahmeed ("Al-hamdu Lillaah") and Takbeer ("Allaahu akbar") during the first ten days of Dhu'l-Hijjah, and for men to say it loudly in the mosque, the home, the street and every place where it is permitted to remember Allaah and mention His name out loud, as an act of worship and as a proclamation of the greatness of Allaah, may He be exalted. (Men should recite these phrases out loud, and women should recite them quietly(.
'Abdullaah ibn 'Umar (may Allaah be pleased with him and his father) reported that the Prophet (r) said:
"There are no days greater in the sight of Allaah and in which righteous deeds are more beloved to Him than these ten days, so during this time recite a great deal of Tahleel ("La ilaaha ill-Allaah"), Takbeer and Tahmeed." (Reported by Ahmad, 7/224; Ahmad Shaakir stated that it is saheeh)
THE SUNNAHS OF EID
4. Take a Ghusl (bath) after Fajr.
5. Brush your teeth.
6. Dress up, putting on best clothes available, whether new or clean old ones.
7. Use perfume (men only).
8. On Eid-al-Adha, eat breakfast only after the Eid Salaah, or after sacrifice* if you are doing a sacrifice.
9. Go to the prayer ground early.
10. Offer Salaat-al-Eid in congregation in an open place except when weather is not permitting like rain, snow, etc. (Do not speak or socialize once the Imam comes out)
11. Use two separate routes to and from the prayer ground.
12. Recite the following Takbir on the way to Salaat and until the beginning of Salaat-al-Eid. **
"Allahu-Akbar, Allahu-Akbar. La ila-ha ill-lal-lah. Allahu-Akbar, Allahu-Akbar. Wa-lilahill hamd."
* Eid ul Adha is the auspicious day of sacrifice. The day on which Hazrat Ibrahim (Alayhi Salaam) was tested to sacrifice his beloved son, Hazrat Ismael (Alayhi Salaam) for the sake of Allah (subhana wa ta'ala). To commemorate this event, Muslims have been directed to sacrifice animals on this day so that they can reflect upon this incident and learn a lesson from it. Muslims are further reminded of sacrifice by giving away a portion of this meat to the neediest in their communities.
**This Takbir should also be recited at least once after every Fardh prayer starting at the time of Fajr on the 9th Zhulhijjah and lasting until the Asr on the 13th Zhulhijjah