Sunan Ibn Majah 500
سنن ابن ماجه#500Sahihحَدَّثَنَا أَبُو مُصْعَبٍ، حَدَّثَنَا عَبْدُ الْمُهَيْمِنِ بْنُ عَبَّاسِ بْنِ سَهْلِ بْنِ سَعْدٍ السَّاعِدِيُّ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ " مَضْمِضُوا مِنَ اللَّبَنِ فَإِنَّ لَهُ دَسَمًا " .
Abdul-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
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Zubair Ali ZaiHasan
In-book reference: 1:234