John 13-16 is called the Upper Room discourse. This is the last time Jesus is with his disciples before His betrayal, arrest, crucifixion, and resurrection. This is just before Passover. Jesus knew this was coming and He is preparing His disciples for the terrible thing they were about to witness. He loved them, and He loved them to the end.
He spends these chapters dealing with the traitor among them and teaching them about who He is and what He is doing. It will end with the great high priestly prayer of Christ in John 17.
We see in this verse a transition. Jesus is turning squarely towards the events that will bring us salvation. He is going willingly, like a lamb to the slaughter, to die for our sins. He will save us from eternal death and separation from God.
Consider: Acts 8:32-35
