Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) used to take a ritual bath (ghusl) on the day of Eid al-Fitr and Eid al-Adha.
Its narrator Hajjaj bin Tamim is not strong, and Abu Ahmad (Ibn Adi) said: His narration is not sound.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6126