(a) Nafi' narrates from Ibn Umar (may Allah be pleased with them both) that he used to take a ritual bath (ghusl) before going out for Eid al-Fitr.
(b) Nafi' said: He used to take a bath on Eid al-Adha and Eid al-Fitr.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6125