John 13:26-30

Jesus answered, "It is the one to whom I will give this piece of bread when I have dipped it in the dish." Then dipping the piece of bread, he gave it to Judas, the son of Simon Iscariot. As soon as Judas took the bread, Satan entered into him. So Jesus told him, "What you are about to do, do quickly." But no one at the meal understood why Jesus said this to him. Since Judas had charge of the money, some thought Jesus was telling him to buy what was needed for the festival, or to give something to the poor. As soon as Judas had taken the bread, he went out. And it was night.

Then dipping the piece of bread, he gave it to Judas 
Matthew 26:14-15  Then one of the Twelve--the one called Judas Iscariot--went to the chief priests and asked, "What are you willing to give me if I deliver him over to you?" So they counted out for him thirty pieces of silver.
John 13:2  The evening meal was in progress and the devil had already prompted Judas, the son of Simon Iscariot, to betray Jesus.

As soon as Judas took the bread, Satan entered into him 
Luke 22:3-4  Then Satan entered Judas, called Iscariot, one of the Twelve. And Judas went to the chief priests and the officers of the temple guard and discussed with them how he might betray Jesus.

Since Judas had charge of the money 
John 12:6  He did not say this because he cared about the poor but because he was a thief; as keeper of the money bag, he used to help himself to what was put into it.

Some thought Jesus was telling him to buy what was needed for the festival 
John 13:1  It was just before the Passover Festival. Jesus knew that the hour had come for him to leave this world and go to the Father. Having loved his own who were in the world, he loved them to the end.

or to give something to the poor 
John 12:4-5  But one of his disciples, Judas Iscariot, who was later to betray him, objected, "Why wasn't this perfume sold and the money given to the poor? It was worth a year's wages."

And it was night 
Luke 22:53  "Every day I was with you in the temple courts and you did not lay a hand on me. But this is your hour--when darkness reigns."  

Scriptures taken from the Holy Bible, New International Version® NIV®, 
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