The title and text of this sermon were mislabeled on the CHBC website. (It is not Isaiah 5-6, he apparently changed the text he used just before preaching). It is available here on iTunes.
This sermon comes from Luke 15:11-32. While this is a very commonly preached-upon text, I think this is the best sermon I've ever heard on it. MacArthur is looking partly at the joy of heaven, how there is a 24/7 party because people are always repenting. Jesus was telling an over-the-top story of grace here that would have enraged the Pharisees. MacArthur proposes a truly shocking but completely logical ending to this story that drives it home in a way you've probably never heard. Don't miss this one.