11 Lay to heart our Lord's example while living with man upon earth. Why had He a money bag, who was ministered unto by angels, save to intimate that His Church was destined thereafter to have her repository for money? Why gave He admission to a thief, save to teach His Church patiently to bear with thieves? But he who had formed the habit of abstracting money from the bag, did not hesitate for money received to sell the Lord Himself. But let us see what answer our Lord gave to such words. See, brethren: He does not say to him, You speak so on account of your thievishness. He knew him to be a thief, yet did not betray him, but rather endured him, and showed us an example of patience in tolerating the wicked in the Church. “Then said Jesus to him: Let her keep it against the day of my burial.” He announced that His own death was at hand.
Source: Tractates on the Gospel of John (New Advent)