It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he saw the Messenger of Allah (peace and blessings be upon him) performing ablution after (eating) pieces of cheese; then he saw him eat a goat's shoulder, then pray without performing ablution.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 724