He will put the sheep on his right and the goats on his left. A separation of every human being into one of just two classes. The right and the left. The righteous and the wicked. The sheep and the goats.
Every person is classified as one of two animals.
We are His flock and He is our Shepherd. Come back here to Zechariah in the Old Testament. Oftentimes God classifies His people as animals. Strike the shepherd, and the sheep will be scattered, and I will turn my hand against the little ones. He is the shepherd, we are the sheep.