Lk 24:47, Acts 1:8
In the Old Testament, Isaiah prophesied that many people would hear the word of God proclaimed in Jerusalem. (Isa 2:3)
Isa 2:3 And many people shall go and say, Come ye, and let us go up to the mountain of the Lord, to the house of the God of Jacob; and he will teach us of his ways, and we will walk in his paths: for out of Zion shall go forth the law, and the word of the Lord from Jerusalem.
The gospel that Jesus is the Christ will be preached to all nations, beginning in Jerusalem. (Luke 24:47, Acts 1:8)
Luke 24:47 And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem.
Acts 1:8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.