9 And now, lastly, listen to what we have here, how this ointment was to some a sweet savor unto life, and to others a sweet savor unto death. When the pious Mary had rendered this grateful service to the Lord, straightway one of His disciples, Judas Iscariot, who was yet to betray Him, said, “Why was not this ointment sold for three hundred pence, and given to the poor?” Alas for you, wretched man! The sweet savor has slain you. For the cause that led him so to speak is disclosed by the holy evangelist. But we, too, might have supposed, had not the real state of his mind been revealed in the Gospel, that the care of the poor might have induced him so to speak. Not so. What then? Hearken to a true witness: “This he said, not that he cared for the poor; but because he was a thief, and had the money bag, and bare what was put therein.” Did he bear it about, or bear it away? For the common service he bore it, as a thief he bore it away.
Source: Tractates on the Gospel of John (New Advent)