To obey God.
Hebrews 5:9---King James Version
9 And being made perfect, he became the author of eternal salvation unto all them that obey him;
Why did you run to Hebrews when we are discussing Jesus teaching on the gospel of the Kingdom ?
I don't think you have studied the gospel of the Kingdom of God. Are you aware that Jesus taught more on the Kingdom of God than any other topic or doctrine ?
Jesus mentions the Kingdom over 100 times in the gospels. So its the most important thing Jesus taught during His earthly ministry. Here are just a few passages on the kingdom from the 4 gospels. The kingdom is like a multi-faceted diamond and the gospel is the core-center of that diamond. There are many facets to the kingdom but there is only one gospel that saves. Your response tells me you have not given the subject any serious thought.
Mark 1:14-15
Jesus came into Galilee, preaching the gospel of God, 15 and saying, “The time is fulfilled, and the kingdom of God is at hand; repent and believe in the gospel.”
Matthew 24:14
And this gospel of the kingdom will be proclaimed throughout the whole world as a testimony to all nations, and then the end will come.
Luke 17:21
Nor will they say, ‘Look, here it is!’ or ‘There!’ for behold, the kingdom of God is in the midst of you.”
John 18:36
Jesus answered, "My kingdom is not of this world; if it were, My servants would fight to prevent My arrest by the Jews. But now, My kingdom is not of this realm."
Romans 14:17 Paul declared that the kingdom of God is a matter “of righteousness and peace and joy in the Holy Spirit.”
The kingdom of God is spiritual—Jesus said His kingdom was not of this world (
John 18:36), and He preached that repentance is necessary to be a part of the kingdom of God (
Matthew 4:17). That the kingdom of God can be equated with the sphere of salvation is evident in
John 3:5–7, where Jesus says the kingdom of God must be entered into by being born again.got?
hope this helps !!!