'Thief' in the Bible

Verily, verily, I say to you, He that enters not in by the door to the fold of the sheep, but mounts up elsewhere, he is a thief and a robber;

The thief comes not but that he may steal, and kill, and destroy: I am come that they might have life, and might have it abundantly.

But he said this, not that he cared for the poor, but because he was a thief and had the bag, and carried what was put into it.