Hadith.1454 - From Zurarah, from Imam Muhammad ibn Ali Al-Baqir عليه السلام who said:
"The prayer of the two Eids (Eid al-Fitr and Eid al-Adha) with the Imam is a Sunnah, and there is no prayer before or after them on that day until noon (zawal)."
The obligation of the holiday is only with a just Imam.