Preach The Kingdom

Then comes the end, when He delivers the kingdom to God the Father, when He puts an end to all rule and all authority and power. For He must reign till He has put all enemies under His feet. 1 Corinthians 15:24-25 NKJV

So in the end He is going to deliver this Kingdom to His Father. Who is in this Kingdom? (us)
"Again, the kingdom of heaven is like treasure hidden in a field, which a man found and hid; and for joy over it he goes and sells all that he has and buys that field. "Again, the kingdom of heaven is like a merchant seeking beautiful pearls, who, when he had found one pearl of great price, went and sold all that he had and bought it. Matthew 13:44-46 NKJV

The Kingdom of Heaven was part and parcel with the message of salvation.
but He said to them, "I must preach the kingdom of God to the other cities also, because for this purpose I have been sent." And He was preaching in the synagogues of Galilee. Luke 4:43-44 NKJV
Now let's look at this….Luke 12:31 But seek the kingdom of God, and all these things shall be added to you. NKJV