(11) باب مَا جَاءَ فِي اللُّقْمَةِ تَسْقُطُ
Narrated Anas:
"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 reference: Book 25, Hadith 17
English translation: Vol. 1, Book 23, Hadith 1803