When Jesus preached “The kingdom of God is at hand, repent and believe” he did not explain what he meant by the kingdom of God. Rather, he assumed that his hearers would know what was meant from the Old Testament – the Psalms and the Prophets spoke extensively about the King and his kingdom. When he said that the kingdom was at hand, what was it that his hearers would have heard him alluding to?
The coming near of the Kingdom of God
Hearing and Doing 