Heifer, ram, and she-goat
In Genesis 15:9, they signify in turn external celestial things, spiritual celestial things, and interior celestial things. (Arcana Coelestia 1821)
Genesis 15:9
9
He said to him, "Bring me a heifer three years old, a female goat three years old, a ram three years old, a turtledove, and a young pigeon."