The Book of Drinks (Kitab Al-Ashriba) 
Muslim :: Book 23 : Hadith 5043
Jabir reported that Allah's Messenger (may peace be upon him) commanded the licking of fingers and the dish, saying: You do not know in what portion the blessing lies."
The Book of Drinks (Kitab Al-Ashriba)
Muslim :: Book 23 : Hadith 5043
Jabir reported that Allah's Messenger (may peace be upon him) commanded the licking of fingers and the dish, saying: You do not know in what portion the blessing lies."