عن ابن عباس رضى الله عنهما قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏"‏إذا أكل أحدكم طعاماً، فلا يمسح أصابعه حتى يلعقها أو يلعقها‏"‏‏.‏ ‏((متفق عليه))

Anas (May Allah be pleased with him) reported

Whenever the Messenger of Allah (ﷺ) ate food, he would lick his three fingers and say, "If anyone of you drops a morsel of food, he should remove any dirt that may have stuck on it and then eat it, and should not leave it for Satan." He (ﷺ) also commanded us that we should glean the pot, saying, "You do not know in which part of your food the blessings lies."[Muslim].