John 10:3-5

and because the gatekeeper knows who he is, he opens the gate to let him in. And the sheep recognize the voice of the true Shepherd, for he calls his own by name and leads them out, for they belong to him. And when he has brought out all his sheep, he walks ahead of them and they will follow him, for they are familiar with his voice. But they will run away from strangers and never follow them because they know it’s the voice of a stranger.”