Judas the thief
John 12:1-6 - Six days before the Passover, Jesus arrived at Bethany, where Lazarus lived, whom Jesus had raised from the dead. Here a dinner was given in Jesus' honor. Martha served, while Lazarus was among those reclining at the table with him. Then Mary took about a pint of pure nard, an expensive perfume; she poured it on Jesus' feet and wiped his feet with her hair. And the house was filled with the fragrance of the perfume.
But one of his disciples, Judas Iscariot, who was later to betray him, objected, "Why wasn't this perfume sold and the money given to the poor? It was worth a year's wages." He did not say this because he cared about the poor but because he was a thief; as keeper of the money bag, he used to help himself to what was put into it.
I wonder how many disciples knew Judas was a thief. (Jesus obviously knew.) How long had they known? Did they try to catch him at it or stop him from it? Why did they let him continue to be the "keeper of the money bag"?
What did Judas use the stolen money for? Food? Things he wanted but couldn't otherwise afford? Gambling? Paying debts? Other things that were sinful in and of themselves?
On the other hand, it's possible (though it barely seems likely) that he used the money to help others. Though it does say he didn't care about the poor.