The women found Jesus' tomb empty. The 'go ahead to Galilee' message was the first they delivered. They gather there and Jesus spoke to them.
The insertion about the chief priests paying the guard extra to change their story is amazing. That grave yard has been a topic of conversation ever since.
The relationship between the authority of Jesus and the mission of the church cannot be overstated. His authority is over both the opposition and the church. This statement makes baptism submission to Christ's authority, if nothing else.