مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3310
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) went out on the day of Eidul-Fitr or Edul-Adha and led the people in praying two rak'ahs, then he left and he did not offer any prayer before or after that.
Musnad Ahmad 3333Its isnad is saheeh, al-Bukhari (964) and Muslim (884)]