The gospel is the good news of the kingdom of God and must be preached to the whole world before the time of the end. The Worldwide Church of God under the leadership of Mr. Herbert W. Armstrong, accomplished a great deal of this commission. At the later times this gospel will be preached by the two witnesses and an angel before the end comes.

Mat 4:23  And Jesus went about all Galilee, teaching in their synagogues, preaching the gospel of the kingdom, and healing all kinds of sickness and all kinds of disease among the people.

Mat 24:14  And this gospel of the kingdom will be preached in all the world as a witness to all the nations, and then the end will come.

Rev 14:6  Then I saw another angel flying in the midst of heaven, having the everlasting gospel to preach to those who dwell on the earth to every nation, tribe, tongue, and people