'Thief' in the Bible

"Truly, I tell all of you emphatically, the person who doesn't enter the sheepfold through the gate, but climbs in by some other way, is a thief and a bandit.

The thief comes only to steal, slaughter, and destroy. I've come that they may have life, and have it abundantly.

He said this, not because he cared about the destitute, but because he was a thief. He was in charge of the moneybag and would steal what was put into it.