The Messenger of Allah ﷺ said, "When one of you eats, let him lick his fingers, for he does not know in which of them the blessing lies."
حدثنا محمد بن عبد الملك بن أبي الشوارب حدثنا عبد العزيز بن المختار عن سهيل بن أبي صالح عن أبيه
قال رسول الله ﷺ إذا أكل أحدكم فليلعق أصابعه فإنه لا يدري في أيتهن البركة
Graded: Also reported by Muslim, in the Book of Drinks, Chapter on the recommendation of licking the fingers and the bowl... [and so on, hadith: 2035, from the hadith of Suhayl, with the same chain]. On this topic there are also narrations from Jabir [Muslim, hadith: 2033, and it will come: 1802], Kaab bin Malik [Tirmidhi in Shamail, hadith: 136, 140], and Anas [it will come: 1803].