Al-Husayn ibn Said from Fadalah from Abdillah ibn Sinan from Abu Abdillah عليه السلام, peace be upon him, said:
Imam al-Sadiq عليه السلام said: “The prayer of the two Eids is two rak’ahs, without adhan and without iqamah. There is nothing before them nor after them (in terms of prayer).”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 3, p. 139