Ibn Abi Umayr, from Ziyad ibn Abi al-Hallal, who said:
Abu Abdillah عليه السلام, peace be upon him, said: “Do not fast for three days after Eid al-Adha, and nor for three days after Eid al-Fitr. Indeed, they are days of eating and drinking.”
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 4, p. 412