I am not ashamed of the gospel of Christ; for it is the power of God unto salvation to everyone that believeth; to the Jew first.
Before God sent His Son to earth, God’s design was to reach the world through Israel, but Israel was unbelieving. Their unbelief is described in a parable about a king who arranged a wedding feast for his son and called for his invited guests (Israel). When the guests refused to come—some were indifferent and others hostile—the king said to his servants, “Therefore go into the highways, and as many as you find, invite to the wedding” (Matt. 22:9). Jesus used this parable to describe apostate Israel, who refused their Messiah and forfeited the celebration planned for them.
God then gave the invitation to another group: the Gentiles. God chose a small group of people gathered on a hillside in Galilee and a few other disciples in Jerusalem to reach the lost world. Through them He would do the work that the nation of Israel had refused to do, and we are called to continue that work.