Mark 16:15-18

Any mention of power? Yes there is, but it is subtle, is it not? They would have power to heal. They would have power to cast out demons. But the wording in the book of Matthew is so obviously focused on authority and power. He said, "I have the power and I am giving it to you!" That is Matthew's approach.

Mark's approach is quite a bit different. He says, "Go," and He implies they are going as a servant. He even hints at a measure of rejection and resistance, and other difficult experiences despite the right attitude and the best of service. The approach is, "I will be working in you."

Mark 16:15-16

After His resurrection, Jesus gave them the final Gospel commission for this age, and in it He commanded baptism as an obligatory ordinance for this Gospel dispensation:

The Gospel was the message He brought and preached—the Good News of the government of God. It is necessary to believe the Gospel to receive salvation. The government (or Kingdom) of God is a kingdom of laws. There can be no government without law. It is "he that is baptized" that will be saved. It is part of the divine commission—a required ordinance for salvation!