Some thought that, because Judas had the moneybag, Jesus was telling him, “Buy what we need for the feast,” or that he should give something to the poor.
29. Or that he should give something to the poor. It is plain enough from other passages how great was Christ’s poverty, and yet, out of the little that he had, he gave something to the poor, in order to lay down a rule for us; for the Apostles would not have conjectured that he had spoken about the poor, if it had not been...
We have here the discovery of Judas's plot to betray his Master. Christ knew it from the beginning; but now first he discovered it to his disciples, who did not expect Christ should be betrayed, though he had often told them so, much less did they suspect that one of them should do it. Now here, I.
Commenting on John 13:18-30
For some of them thought,.... This was the thought of some of the disciples, it may be of all of them but John; because Judas had the bag: which was for the common supply of Christ and his disciples, and for the relief of the poor; See Gill on Joh 12:6.