They were preaching the gospel—-
-"Now when He was asked by the Pharisees when the kingdom of God would come, He answered them and said, "The kingdom of God does not come with observation; nor will they say, ‘See here!’ or ‘See there!’ For indeed, the kingdom of God is within you.""
Luke 17:20-21 NKJV
-"And heal the sick there, and say to them, ‘The kingdom of God has come near to you.’ But whatever city you enter, and they do not receive you, go out into its streets and say, ‘The very dust of your city which clings to us we wipe off against you. Nevertheless know this, that the kingdom of God has come near you.’"
Luke 10:9-11 NKJV
The “Church” are the local believers/ members in Christ.