Ja'far bin Abdullah (may Allah have mercy on him) said: Al-Hakam (may Allah be pleased with him) saw me (al-Nu'man said: I think he was al-Ghifari (may Allah be pleased with him)) while I was a boy, eating from here and there. So he said: My son, do not eat like this; this is how Satan eats. "When the Messenger of Allah (peace and blessings be upon him) placed his hand in a bowl or vessel, his (peace and blessings be upon him) fingers did not go beyond the place of his palm."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3150