Expositor's Bible Commentary Commentary John 12:4

"But Judas Iscariot, one of his disciples, that should betray him, saith," — John 12:4 (ASV)

Judas Iscariot reappears here (cf. 6:70–71, the only previous mention of him in this gospel). Jesus knew Judas’s tendencies and was well aware of his coming defection. Whereas many of Jesus’ disciples had deserted him (6:66), Judas remained to betray him. He was determined to make Jesus serve his purpose— by treachery if necessary.

Judas had been appointed treasurer of the band of disciples, but he had been using his office for his own enrichment. His remonstrance over Mary’s gift revealed that he had a sharp sense of financial values and no appreciation of human values.