Kabbalah sur Daniel 2:38

Rabi Aba said to him: And this cow is sacred, this [cow] is pure, and why? He answered this is so, and the cow is established, it includes four reigns. "Cow", as it says "For Israel is stubborn like a stubborn cow" (Hosea 4:16). "Red" this is the reign of Bavel, as it says "You are a head of gold" (Daniel 2:38). "Unblemished", this is the reign of Persia."without any defects", this is the reign of Greece (because they come close to the ways of faith). "On which no yoke has been laid", this is the reign of Edom, in which no yoke has been laid. And the secret of this thing, even though there are many words in this midrash, all of them are one.