Alcuin
Catena Aurea · Johannesevangelium 10
Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep. All that ever came before me are thieves and robbers: but the sheep did not hear them. I am the door: by me if any man enter in, he shall be saved, and shall go in and out, and find pasture. The thief cometh not, but for to steal, and to kill, and to destroy: I am come that they might have life, and that they might have it more abundantly. All that ever came before Me are thieves and robbers.
The thief cometh not but for to steal, and to kill. As if He said, And well may the sheep not hear the voice of the thief; for he cometh not but for to steal: he usurpeth another’s office, forming his followers not on Christ’s precepts, but on his own. And therefore it follows, and to kill, i. e. by drawing them from the faith; and to destroy, i. e. by their eternal damnation.