The Prophet ﷺ ordered that the fingers and the dish be licked clean, saying, "You do not know in which part of it the blessing lies."
أن النبي ﷺ أمر بلعق الأصابع والصحفة، وقال: إنكم لا تدرون في أيه البركة.
Muslim narrated it in the Book of Drinks (2033:133), from Abu Bakr bin Abu Shayba, who said, Sufyan bin Uyayna told us, from Abu Zubayr, from Jabir, and he related it.