Even my own familiar friend in whom I trusted, who ate my bread, has lifted up his heel against me. Ps 41:9
Hours before His arrest, Jesus quoted from Psalm 41 (John 13:18). This scripture finds fulfillment in the friendship of Jesus and Judas Iscariot.
Judas is not as he appears.
He seems trustworthy and is treasurer of the group (John 13:29) and he appears to have genuine concern for others (John 12:4-5).
However, neither is true (John 12:6).
Greed leads him to sell out Jesus for thirty pieces of silver (Matt 26:14-16).
Judas is not a popular man being the betrayer of the Lord Jesus. But it seems every disciple of Jesus entertained the thought of betraying Him (Matt 26:20-22)
It is clear that someone would betray Him to fulfill the scripture.
Judas became that person, but Peter, James, John, or any of the others could just as easily betray Him.
The problem with Judas is not in betraying Jesus. His problem is in failing to repent afterward. Though remorseful enough to return the money (Matt 27:3-4), he failed to see this as an opportunity to repent and seek forgiveness. Instead he kills himself (Matt 27:5)
Peter also betrayed the Lord in some sense. He denied he knew Jesus with cursing and swearing! (Matt 26:73-74)
By all accounts it seems Peter repented as he cried over his action. At least he did not kill himself!
You can betray Jesus, deny Him, curse and swear, spit in His face, tear down churches, rip up Bibles, and do everything in your power to eliminate Christianity. Those things are not the greatest sins against God.
The greatest sin a person commits is failing to recognize Jesus as the Way of salvation, by which that you fail to repent and ask the Lord for forgiveness, especially since He gave His life for you!
Other scriptures referenced above:
John 13:18 I do not speak concerning all of you. I know whom I have chosen; but that the Scripture may be fulfilled, ‘He who eats bread with Me has lifted up his heel against Me.’
John 13:29 For some thought, because Judas had the money box, that Jesus had said to him, “Buy those things we need for the feast,” or that he should give something to the poor.
John 12:4-5 But one of His disciples, Judas Iscariot, Simon’s son, who would betray Him, said, “Why was this fragrant oil not sold for three hundred denarii and given to the poor?”
John 12:6 This he said, not that he cared for the poor, but because he was a thief, and had the money box; and he used to take what was put in it.
Matt 26:14-16 Then one of the twelve, called Judas Iscariot, went to the chief priests and said, “What are you willing to give me if I deliver Him to you?” And they counted out to him thirty pieces of silver. So from that time he sought opportunity to betray Him.
When evening had come, He sat down with the twelve. Now as they were eating, He said, “Assuredly, I say to you, one of you will betray Me.”
And they were exceedingly sorrowful, and each of them began to say to Him, “Lord, is it I?”
Matt 27:3-4 Then Judas, His betrayer, seeing that He had been condemned, was remorseful and brought back the thirty pieces of silver to the chief priests and elders, saying, “I have sinned by betraying innocent blood.”
Matt 27:5 Then he threw down the pieces of silver in the temple and departed, and went and hanged himself.
Matt 26:73-74 And a little later those who stood by came up and said to Peter, “Surely you also are one of them, for your speech betrays you.”
Then he began to curse and swear, saying, “I do not know the Man!”
Immediately a rooster crowed.