It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that once the Prophet (peace and blessings be upon him) ate the meat of the shoulder and performed prayer, and did not perform a fresh ablution.
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 2406
Hadith Gradingحکم دارالسلام:حديث صحيح، خ: 207، سماك بن حرب فى روايته عن عكرمة خاصة مضطرب، لكنه توبع