The Messenger of Allah ﷺ drank some milk, then called for water and rinsed his mouth, saying, "It has fat in it."
حدثنا حجاج حدثنا ليث حدثنا عقيل عن ابن شهاب عن عبيد الله بن عبد الله بن عتبة
شرب رسول الله ﷺ لبنا ثم دعا بماء فمضمض ثم قال إن له دسما
Its isnad is sahih. It is a repetition of 3051.