The Messenger of Allah ﷺ used to eat with three fingers, and he would not wipe his hand until he had licked it clean.
حدثنا أبو معاوية قال حدثنا هشام بن عروة عن عبد الرحمن بن سعد
كان رسول الله ﷺ يأكل بثلاث أصابع ولا يمسح يده حتى يلعقها
Its isnad is sahih. It has already appeared in 15707.