Interesting stuff in this chapter.
John 13:3 & 4
Jesus knew that the Father had put all things under his power, and that he had come from God and was returning to God; so he got up from the meal, took off his outer clothing, and wrapped a towel around his waist.
The use of the word "so" here is very interesting. "So" is a word that indicates a logical conclusion to a circumstance. For example, "I was hungry, so I ate." "I wanted a good job, so I went to college." "I needed to lose weight, so I started dieting." The circumstance presented in these verses and the conclusion doesn't make sense to me. Jesus has all power, came from God and is returning to God, and is the radiance of God's glory and the exact representation of His being (Hebrews 1:3), so he washed His disciples' feet. I'll have to let this marinate in my head a while.
John 13:25 - 29
Leaning back against Jesus, [John] asked him, "Lord, who is it?" 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 Iscariot, son of Simon. As soon as Judas took the bread, Satan entered into him. "What you are about to do, do quickly," Jesus told him, 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 Feast, or to give something to the poor.
This is the "last supper." Jesus has announced one of His disciples will betray him. John, leaning on Jesus, asks Him, "who is it?" It doesn't say it in the scripture, but it seems to me that Jesus whispered his reply to John; nobody else could hear Him. "It is the one to whom I will give this piece of bread when I have dipped it in the dish." If all of the disciples had heard this, there would not have been any question of what Judas was leaving to do. Instead they assumed he was going to buy more food for the meal, or give to someone in need. So why did Jesus tell John and none of the other disciples?