'Shepherd' in the Bible

The one who enters through the gate is the shepherd of the sheep.

"I'm the good shepherd. The good shepherd lays down his life for the sheep.

The hired worker, who isn't the shepherd and doesn't own the sheep, sees the wolf coming, deserts the sheep, and runs away. So the wolf snatches them and scatters them,

I'm the good shepherd. I know my own and my own know me,

I have other sheep that don't belong to this fold. I must lead these also, and they'll listen to my voice. So there will be one flock and one shepherd.