I love this passage. I think many preachers do. “Love one another as I have loved you” is rich in theology and potential sermon directions. I got hung up on the first bit, “When he had gone out…” Which points to how much else is going on.
Here’s what I said:

I worked most closely with John 13.31-35 but I’m going to link you to all of John 13, because it is relevant.