Nafi' narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that after the day of Eid al-Adha there are two further days for sacrifice. (b) Sayyiduna Ali (may Allah be pleased with him) says that after the day of Eid al-Adha there are two further days of sacrifice.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19254