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Why is Holy Wednesday also called Spy Wednesday?

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Raphael: Resurrection of Christ — Easter *Resurrection of Christ*, oil on wood panel by Raphael, 1499–1502; in the Museu de Arte de São Paulo, São Paulo, Brazil. 52 × 44 cm.

Holy Wednesday is called Spy Wednesday because it commemorates the day on which Judas Iscariot plotted to betray Jesus.1

The name refers to Judas acting as a "spy" by disclosing Jesus’ whereabouts to the chief priests and elders in exchange for 30 pieces of silver. This event is a central focus of the day's observances during Holy Week, the solemn period leading up to Easter.21