It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) once drank milk and then rinsed his mouth and said, "It has greasiness in it."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 3050
Hadith Gradingحکم دارالسلام:حديث صحيح، محمد بن مصعب متابع، خ: 211، م: 358