"When the Prophet (ﷺ) ate, he would lick his three fingers, and he said: 'If one of you drops a piece (of food) then let him remove any harm (dirt) from it and eat it, and do not leave it for Ash-Shaitan.' And he would order us to finish (clean) the dish. And he said: 'Indeed you do not know in which part of your food is the blessing.'
[Abu 'Eisa said:] This Hadith is Hasan Gharib Sahih.
Reference: Jami` at-Tirmidhi 1803 In-book : Book 25, Hadith 17 English translation : Vol. 1, Book 23, Hadith 1803
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