"But they will never follow a stranger; in fact, they will run away from him because they do not recognize a stranger's voice."
NIV
They will never [on any account] follow a stranger, but will run away from him because they do not know the voice of strangers or recognize their call.
AMP
And a stranger will they not follow, but will flee from him: for they know not the voice of strangers.
KJV
The gatekeeper opens the gate for him, and the sheep listen to his voice. He calls his own sheep by name and leads them out.
NIV
The watchman opens the door for this man, and the sheep listen to his voice and heed it; and he calls his own sheep by name and brings (leads) them out.
AMP
To him the porter openeth; and the sheep hear his voice: and he calleth his own sheep by name, and leadeth them out.
KJV
The hired hand is not the shepherd and does not own the sheep. So when he sees the wolf coming, he abandons the sheep and runs away. Then the wolf attacks the flock and scatters it.
NIV
But the hired servant (he who merely serves for wages) who is neither the shepherd nor the owner of the sheep, when he sees the wolf coming, deserts the flock and runs away. And the wolf chases and snatches them and scatters [the flock].
AMP
But he that is an hireling, and not the shepherd, whose own the sheep are not, seeth the wolf coming, and leaveth the sheep, and fleeth: and the wolf catcheth them, and scattereth the sheep.
KJV