Sayyiduna al-Dahhak bin Sufyan al-Kilabi (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "O Dahhak, what is your food?" I said: Meat and milk. He (peace and blessings be upon him) said: "Then what does it turn into?" I said: Then it turns into what you know. At that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, Allah, the Mighty and Majestic, has made what comes out of the son of Adam a parable for this world."
Hadith Referenceالمعجم الكبير للطبراني / باب الضاد / 8107