Mark 1:15

1:15 The time is fulfilled. The past times, especially of God’s acts of salvation for His people Israel, reach their climax in this present time of salvation through Jesus.

the kingdom of God is at hand. The kingdom of God is that final state of affairs where God’s supreme reign is fully realized over the transformed universe and in the hearts of all His redeemed and glorified people. This kingdom is “at hand” in the sense that the coming of Jesus sets in motion all that will bring about its actualization. God requires repentance and belief in response to this news. See note on v. 4.