It wasnarrated from Hasan about Ma'qil bin Yasar:
"While (he) waseating lunch, a morsel of food fell on the floor. He picked it up,removed whatever dirt had gotten onto it, and ate it. The villagersand farmers winked at one another (finding it odd) and it was said:'May Allah help the chief! These villagers and farmers are winkingatone another because you picked up a morsel (from the ground) whenyouhave this food in front of you.' He said: 'I am not going togive upsomething I heard from the Messenger of Allah (ﷺ) for thesenon-Arabs. We were told, if one of us dropped a morsel of food, topick itup, remove whatever dirt was on it, and eat it, and not toleave itfor Satan.'"
English reference: Vol. 4, Book 29, Hadith 3278
Arabic reference: Book 29, Hadith 3403