Some of the scholars use the following hadeeth to show that the three days of tashreeq which come after Eid al-Adha are also considered as being days of Eid:
عَنْ عُقْبَةَ بْنِ عَامِرٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ “ إِنَّ يَوْمَ عَرَفَةَ وَيَوْمَ النَّحْرِ وَأَيَّامَ التَّشْرِيقِ عِيدُنَا أَهْلَ الإِسْلاَمِ وَهِيَ أَيَّامُ أَكْلٍ وَشُرْبٍ ”
It was narrated from Uqbah bin Amir that the Messenger of Allah said:
“The day of Arafah and the day of sacrifice and the day of At-Tashriq is our Eid, the people of Islam, and they are days of eating and drinking.”
[Reported by At-Tirmidhee and others]
Contrary to Eid al-Fitr since it is a period of one day only and it is not followed with any days of Tashreeq.
AbdulFattaah Bin Uthman