Mishkat al-Masabih #288
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَبْدِ اللَّهِ بْنِ عَبَّاسٍ قَالَ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ شَرِبَ لَبَنًا فَمَضْمَضَ وَقَالَ: «إِنَّ لَهُ دسما»
‘Abdallah b. ‘Abbas said that God’s messenger drank some milk and rinsed his mouth saying, “It contains greasiness.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #288 from Mishkat al-Masabih, in the Book of Purification.