The Messenger of Allah ﷺ rinsed his mouth after drinking milk and said, "It has greasiness to it."
حدثنا عثمان بن عمر حدثنا يونس عن الزهري عن عبيد الله بن عبد الله
أن رسول الله ﷺ تمضمض من لبن وقال إن له دسما
No references are available.
Its isnad is sahih, and Bukhari also narrated it, as in Muntaqa 4791.