John 10:3-5

The doorkeeper opens [the gate] for this man, and the sheep hear his voice and pay attention to it. And [knowing that they listen] he calls his own sheep by name and leads them out [to pasture]. When he has brought all his own sheep outside, he walks on ahead of them, and the sheep follow him because they know his voice and recognize his call. They will never follow a stranger, but will run away from him, because they do not know the voice of strangers.”