Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: I saw the Messenger of Allah (peace and blessings be upon him) during the Farewell Hajj; on the Day of Sacrifice (Yawm al-Nahr), while he (peace and blessings be upon him) was performing tawaf of the House, a piece of meat on the bone was brought to him (peace and blessings be upon him). He (peace and blessings be upon him) bit pieces off it with his teeth and ate, then prayed and did not perform ablution.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10749