"Amen, amen I say to you: He that entereth not by the door into the sheepfold, but climbeth up another way, the same is a thief and a robber. But he that entereth in by the door is the shepherd of the sheep. To him the porter openeth; and the sheep hear his voice: and he calleth his own sheep by name, and leadeth them out. And when he hath let out his own sheep, he goeth before them: and the sheep follow him, because they know his voice. But a stranger they follow not, but fly from him, because they know not the voice of strangers."
John 10: 1-5