سُنَنُ ابْنِ مَاجَهْ
Sunan Ibn Majah 498
The Book of Purification and its Sunnah
Rinsing the mouth due to drinking milk
حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ الدِّمَشْقِيُّ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا الأَوْزَاعِيُّ، عَنِ الزُّهْرِيِّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَالَ مَضْمِضُوا مِنَ اللَّبَنِ فَإِنَّ لَهُ دَسَمًا .
It was narrated from Ibn 'Abbas that: The Prophet (ﷺ) said: 'Rinse your mouths after drinking milk for there is some greasiness in it."
Sunan Ibn Majah, 498Sahih (Darussalam)