John 13:29

For some of them thought, because Judas had the bag, that Jesus had said unto him, Buy those things that we have need of against the feast; or, that he should give something to the poor.

Cross-references

John 12:5 shows Judas feigning concern for the poor; here the disciples think he is going to give to them.

John 12:6 exposes Judas as a thief who stole from the moneybag—directly contradicting the disciples' charitable assumption here.