Jesus says why that cant happen, one of His sheep following another.
John 10
4 And when he putteth forth his own sheep, he goeth before them, and the sheep follow him: for they know his voice.
5 And a stranger will they not follow, but will flee from him: for they know not the voice of strangers.
6 This parable spake Jesus unto them: but they understood not what things they were which he spake unto them.
Lots of people still dont understand Jesus's words.
You must unlearn what you have learned.
His sheep flee from and they dont hear strange voices, meaning they wont follow a stranger, they will give them no heed.
7 Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep.
8 All that ever came before me are thieves and robbers: but the sheep did not hear them.