Catena Aurea on John 12:1–11: Augustine of Hippo

Then saith one of His disciples, Judas Iscariot, Simon’s son, which should betray Him, Why was not this ointment sold for three hundred pence, and given to the poor? In the other Gospels it is the disciples who murmured at the waste of the ointment. I think myself that Judas is put for the whole body of disciples; the singular for the plural. But at any rate we may supply for ourselves, that the other disciples said it, or thought it, or were persuaded by this very speech of Judas. The only difference is, that Matthew and Mark expressly mention the concurrence of the others, whereas John only mentions Judas, whose habit of thieving He takes occasion to notice: This he said, not that he cared for the poor, but because he was a thief, and had the bag, and bare what was put therein.