Matthew 10: 7-8. “And as ye go, preach, saying, The kingdom of heaven is at hand. Heal the sick, cleanse the lepers, raise the dead, cast out devils: freely ye have received, freely give.”
The disciples were told to preach only one message: The kingdom of heaven is at hand. I think we need to review what that meant.
Putting it as simply and clearly as I can, it meant that the promised Kingdom for Israel, and through Israel to the nations; the Kingdom with all its earthly blessing, was about to come. It was announcing the fact of the presence of the King, if His own chosen people would have it.
Such a preaching of the Kingdom is not given now. Once the Church has been removed from the earth into heaven, then the Kingdom will again draw night in the Person of the returning King with His saints.
Israel did not accept Him; did not believe Him; did not receive Him the first time He came. But the next time, it will all be different. The next time, He will not be condemned and crucified; He will reign in the earth for 1000 years, and His Word will be the Law.
The disciples were empowered to do the same kinds of miracles that Jesus had been doing, including raising people from death and casting out demons. These miracles were proof of His Messianic power and authority, and were NOT a sign of the supernatural powers of these men. The were given only to declare the coming of the Kingdom, not to make these men objects of worship.
Finally, Jesus tells them not to expect pay. He reminds them that they have received His power and presence freely; therefore, they were to give back to the people freely.