In the Old Testament Joseph, who prefigured Christ, was betrayed by his older brother, Judah -- the father of the tribe whence came King David and through which the Messianic prophecies were fulfilled -- when Judah sold Joseph into slavery in Egypt for so many shekels of silver (see Genesis 37-38, and also Psalm 68:2-29 and Acts 1:13-20).
From that tribe of Judah came Our Lord, Who was betrayed by another Judah, a man who is more commonly known as Judas Iscariot ("Iscariot" refers to Kerioth, a town in Judea). This Judas handled the money for the Apostles and became offended by the extravagance of Mary Magdalen's gesture of love toward Jesus:
John 12:1-8 1
Jesus therefore, six days before the pasch, came to Bethania, where Lazarus had been dead, whom Jesus raised to life. And they made him a supper there: and Martha served: but Lazarus was one of them that were at table with him. Mary therefore took a pound of ointment of right spikenard, of great price, and anointed the feet of Jesus, and wiped his feet with her hair; and the house was filled with the odour of the ointment.
Then one of his disciples, Judas Iscariot, he that was about to betray him, said: Why was not this ointment sold for three hundred pence, and given to the poor? Now he said this, not because he cared for the poor; but because he was a thief, and having the purse, carried the things that were put therein.
Jesus therefore said: Let her alone, that she may keep it against the day of my burial. For the poor you have always with you; but me you have not always. Immediately after this, Judas met with the chief priests to betray Our Lord for thirty pieces of silver.
Here is St. Matthew's version of History:
And when Jesus was in Bethania, in the house of Simon the leper, There came to Him a woman having an alabaster box of precious ointment, and poured it on His head as He was at table.
And the disciples seeing it, had indignation, saying: To what purpose is this waste? For this might have been sold for much, and given to the poor.
And Jesus knowing it, said to them: Why do you trouble this woman? for she hath wrought a good work upon me. For the poor you have always with you: but me you have not always. For she in pouring this ointment upon my body, hath done it for my burial. Amen I say to you, wheresoever this gospel shall be preached in the whole world, that also which she hath done, shall be told for a memory of her.
Then went one of the twelve, who was called Judas Iscariot, to the chief priests, And said to them: What will you give me, and I will deliver him unto you? But they appointed him thirty pieces of silver.
Thus today the Spy is Judas also today and during the Sacred Triduum, the Matins and Lauds of the Divine Office are often sung in a haunting service known as the Tenebrae service ("tenebrae" meaning "shadows"), which is basically a funeral service for Jesus.
During the Matins on Good Friday, one by one, the candles are extinguished in the Church, leaving the congregation in total darkness, and in a silence that is punctuated by the strepitus meant to evoke the convulsion of nature at the death of Christ. It has also been described as the sound of the tomb door closing. During the Triduum, the Matins and Lauds readings come from the following day's readings each night because the hours of Matins and Lauds were pushed back so that the public might better participate during these special three days (i.e., the Matins and Lauds readings heard at Spy Wednesday's tenebrae service are those for Maundy Thursday, the readings for Maundy Thursday's tenebrae service are from Good Friday, and Good Friday's readings are from Holy Saturday's Divine Office).