Ibn Abbas reported the Messenger of Allah ﷺ as saying: When one of you eats, he must not wipe his hand with a handkerchief till he licks it or gives it to someone to lick.
Hadith Referenceسنن ابي داود / كتاب الأطعمة / 3847
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (5456) صحيح مسلم (2031)