It is recommended to lick one's fingers and wipe the bowl, and to eat a piece of food that is dropped after removing any dirt on it. It is disliked to wipe one's hand before licking it, because of the possibility that the blessing of the food may be in that remaining part. The Sunnah is to eat with three fingers
This hadith is reported on the authority of A'mash with the same chain of transmitters but with a slight variation of words but no mention is made of the first part of the hadith, i. e. the Satan is present with any one of you.