Answer
Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
Fasting on Eid is prohibited in Islam because Eid Al-Fitr is a day of celebration and breaking the Ramadan fast, while Eid Al-Adha is meant for sacrifice and feasting. Observing a fast on these days contradicts the essence of these religious occasions, as commanded in Islamic teachings.
The late Saudi scholar Sheikh Ibn `Uthaymeen said:
The wisdom of not offering fast on the day of Eid is that the day of Eid Al-Fitr is the day of breaking the fast from Ramadan, and Ramadan cannot be specified [singled out] except by breaking the fast [not fasting] on the day of Eid.
With regard to Eid Al-Adha, it is because it is the day of sacrifice, and if people were to fast on this day, they would have acted differently from what Allah loves and ordered us to do in His saying โSo eat of them and feed the miserable and poor.โ (Al-Hajj 22:28), how could a fasting person eat from them?
Allah Almighty knows best.
Editorโs note: This fatwa is from Ask the Scholarโs archive and was originally published at an earlier date.
Source: www.islamweb.net.