وَعَنِ ابْنِ عَبَّاسٍ
أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَقَّ عَنِ الْحَسَنِ وَالْحُسَيْنِ كَبْشًا كَبْشًا
Ibn Abbas told that God’s messenger sacrificed a ram on the seventh day for both al-Hasan and al-Husain. Abu Dawud transmitted it. Nasai says two rams each.
Mishkat al-Masabih 3989, Book 21, Game and Animals Which May Be Slaughtered, Hadith 90. 1 min read