Sahih Muslim Book 23, Hadith Number 5047.

Chapter : The merit of licking the fingers after taking food and wiping the dish (with fingers) and eating of the fallen mouthful after removing the dirt sticking to it.

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.