Abdullah b. Ka'b reported that his father Ka'b narrated to him that Allah's Messenger (ﷺ) used to eat with three fingers and when he had finished (eating), he licked them.
Reference: Sahih Muslim 2032 c In-book : Book 36, Hadith 172 USC-MSA web (English) : Book 23, Hadith 5041 (deprecated)
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