Episode 44: Fasting the days of Tashriq
'A'isha (may Allah be pleased with her) said that the Prophet (may peace be upon him) forbade to observe fast on two days - the day of Fitr and the day of Adha.
In another hadeeth
Nubaisha al-Hudhali reported Allah's Messenger (may peace be upon him) as saying: The days of Tashriq are the days of eating, drinking and remembrance of Allah.
Both hadeeths were related by Muslim