This is a good question. The most obvious example would be the baptism of Jesus. We can read of the baptism of Jesus in Matthew, Mark and Luke.
The baptism of Jesus takes place during the time John is baptizing people at the Jordan. John was baptizing people for repentance. However, the only person that did not have to repent is Jesus, because Jesus is the only one without sin according to the gospel writers. This is why John felt odd in baptizing Jesus. Jesus allows it, because Jesus is associating with his people, as sin bearer.
After this baptism, Jesus entered into his public ministry. He "began" his work as the savior of the world, according to the gospels. From this perspective, there was a transformation of epic proportions.