Jesus Christ - the Good Shepherd

This is one of the oldest depictions of the Christ in the Christian iconography.
The Christ is depicted here as a young man carrying a lost sheep.

I am the good shepherd. The good shepherd lays down his life for the sheep.
He who is a hired hand, and not a shepherd, who doesn't own the sheep, sees the wolf coming, leaves the sheep, and flees. The wolf snatches the sheep, and scatters them. The hired hand flees because he is a hired hand, and doesn't care for the sheep.
I am the good shepherd. I know my own, and I'm known by my own; even as the Father knows me, and I know the Father. I lay down my life for the sheep. I have other sheep, which are not of this fold. I must bring them also, and they will hear my voice. They will become one flock with one shepherd. _{John 10:11-16}