It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that a bowl of tharid was presented to the Messenger of Allah (peace and blessings be upon him). He said: "Eat from the edges of the bowl (dish), and do not eat from the middle, for indeed, blessing descends in the middle of the food (and spreads to all sides)."
Hadith Referenceمسند احمد / ومن مسند بني هاشم / 3190