There is a long tradition in the UK of calling this day, the Wednesday of Holy Week, Spy Wednesday.
Spy Wednesday gets its name because this is the day on which Judas betrayed Jesus to the Sanhedrin. Because Judas is thought to be sneaky, his actions conjured up the image of a spy reporting to the leaders of the people. The synoptic gospels all include an account of the betrayal — Matthew 26:12-14, Mark 14:10-12, Luke 22:3-6.
This is how the Gospel of Matthew (26: 14 – 25) recounts the events:
One of the Twelve, the man called Judas Iscariot, went to the chief priests and said, ‘What are you prepared to give me if I hand him over to you?’ They paid him thirty silver pieces, and from that moment he looked for an opportunity to betray him.
Now on the first day of Unleavened Bread the disciples came to Jesus to say, ‘Where do you want us to make the preparations for you to eat the passover?’ ‘Go to so-and-so in the city’ he replied ‘and say to him, “The Master says: My time is near. It is at your house that I am keeping Passover with my disciples.”’ The disciples did what Jesus told them and prepared the Passover.
When evening came he was at table with the twelve disciples. And while they were eating he said ‘I tell you solemnly, one of you is about to betray me.’ They were greatly distressed and started asking him in turn, ‘Not I, Lord, surely?’ He answered, ‘Someone who has dipped his hand into the dish with me, will betray me. The Son of Man is going to his fate, as the scriptures say he will, but alas for that man by whom the Son of Man is betrayed! Better for that man if he had never been born!’ Judas, who was to betray him; asked in his turn, ‘Not I, Rabbi, surely?’ ‘They are your own words’ answered Jesus.
This is the gospel of today’s Mass, so we can reflect on our own response to Jesus. Are we ready to follow him to the end, or would we sell him for our own experience or pleasure; be it silver pieces or the sins which most tempt us.