Sunan Ibn Majah 500
سنن ابن ماجه#500SahihAbdul-Muhaimin bin 'Abbas bin Sahl bin Sa'd As-Sa'di narraed from his father, from his grandfather, that:The Messenger of Allah said: "Rinse your mouths after drinking milk, for it has some greasiness in it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiHasan
In-book reference: 1:234