Sahih Muslim · Hadith 5427

وحدثني محمد بن حاتم، حدثنا بهز، حدثنا وهيب، حدثنا سهيل، عن أبيه، عن أبي هريرة، عن النبي صلى الله عليه وسلم قال ‏"‏ إذا أكل أحدكم فليلعق أصابعه فإنه لا يدري في أيتهن البركة ‏"‏ ‏.‏

Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: When any one of you eats food he should lick his fingers, for he does not know in what part of the food sticking to his fingers the blessing lies. This hadith has been reported on the authority of Hammad with the same chain of transmitters, but with a slight variation of wording.

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).