The Prophet ﷺ used to eat with three fingers and would not wipe his hand until he had licked it clean.
حدثنا النفيلي حدثنا أبو معاوية عن هشام بن عروة عن عبد الرحمن بن سعد
أن النبي ﷺ كان يأكل بثلاث أصابع ولا يمسح يده حتى يلعقها
Recorded by Muslim in the Book of Drinks, chapter on the recommendation of licking the fingers and the bowl, etc., hadith no. 2032, from the hadith of Abu Muawiya al-Darir with this wording.