It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) forbade fasting on three days: hastening a fast on the day before the Day of Tarwiyah, and fasting on the day of Eid al-Fitr and the day of Eid al-Adha.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10015