It was narrated from Ibn ‘Abbas that the Prophet (ﷺ) said: “When one of you eats food, let him not wipe his hand until he has licked it or has someone else to lick it.”
It was narrated from Jabir that the Messenger of Allah (ﷺ) said: “None of you should wipe his hand until he has licked it, for he does not know where the blessing if in his food.’”