John 13:21-30 (ESVST)
21 After saying these things, Jesus was troubled in his spirit, and testified, “ Truly, truly, I say to you, one of you will betray me.” 22 The disciples looked at one another, uncertain of whom he spoke.
“After saying these things”, refers to what Jesus just said regarding the servant not being greater that the master in verse 20 above. Jesus was troubled knowing that he was about to be betrayed and knew what was coming after this betrayal. It is not clear whether Jesus was worried or troubled about the fact that Judas was about to be an apostate or wether it was about the tribulation he was going to go through including the cross, because of what Judas is about to do. I say maybe even both. Jesus then told them that one of them was going to betray him. As you would expect, they were all shocked at this statement.
23 One of his disciples, whom Jesus loved, was reclining at table at Jesus ‘side,
There are a lot of translations of this verse. “leaning on Jesus ‘bosom,” KJV; “lying close to the breast of Jesus,” RSV; “reclining on Jesus’ breast,” NASB; “reclining next to him,” NIV, NRSV. Whatever the translation, it is clear that this disciple was truly loved by Jesus and was sitting next to Jesus at a place of honor. Think about even in today’s world, the closer to the boss you sit, the higher is your rank. I beleive the same thing happened here. This disciple whom everyone accept, is John the author of this Gospel, was loved and sitting at a place of honor next to The Lord.
24 so Simon Peter motioned to him to ask Jesus of whom he was speaking. 25 So that disciple, leaning back against Jesus, said to him, “ Lord, who is it?” 26 Jesus answered, “It is he to whom I will give this morsel of bread when I have dipped it.” So when he had dipped the morsel, he gave it to Judas, the son of Simon Iscariot.
Peter then asked John to ask Jesus who is it that will betray him. Jesus told them that it is the one whom he shall give the morsel of bread or a piece of bread after he had dipped it. Jesus did this and gave the bread to Judas Iscariot.
27 Then after he had taken the morsel, Satan entered into him. Jesus said to him, “What you are going to do, do quickly.” 28 Now no one at the table knew why he said this to him. 29 Some thought that, because Judas had the moneybag, Jesus was telling him, “ Buy what we need for the feast,” or that he should give something to the poor. 30 So, after receiving the morsel of bread, he immediately went out. And it was night.
After Jesus gave him the bread, satan entered Judas. Now it is not clear wether this means satan possessed Judas but, the Greek word used for enter, does not mean posses. So, wether it was by possession of simply by controlling his heart, the devil entered Judas. Jesus told him to do what he is about to do very quickly. In other words, Judas must keep to the divine schedule. The other disciples misunderstood what Jesus was saying to Judas. After this, Judas left. John does not tell us the reaction of the other disciples on seeing that Judas was going to betray him and I am also not clear as to why John ended the verse with the words “and it was night”. Anything I say would be an assumption.