It wasnarrated from Ibn 'Abbas that the Prophet (ﷺ) said:
"Whenoneof you eats food, let him not wipe his hand until he has licked itorhas someone else to lick it." (PT)
English reference (PT): Vol. 4, Book 29, Hadith 3269 (PT)
Arabic reference (PT): Book 29, Hadith 3393 (PT)