A snippet from Wineskins.org
Acts is, in many ways, the story of God’s kingdom expanding into all the world. Jesus’ final words to his apostles were, “you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the farthest parts of the earth.” (Acts 1:8 NET). We see that theme progress throughout the book as the apostles spread the good news in Jerusalem (Acts 1-7), persecution scattering the young church throughout Judea (8:1-3) and Samaria (8:4-25), and, through Paul, all across the Roman Empire (9-28).
But to see the words of Jesus and the events in Acts as a purely geographical movement misses something critical in the story.
Philip and the Ethiopian
After Philip spread the good news to Samaria but before Paul is introduced in the story we see Philip sent by the Holy Spirit to have an encounter with an Ethiopian (8:26-40). This was no normal Ethiopian. First he was a God-fearer, that class of people who were not Jewish by birth but still worshiped Yahweh. Second, he was the treasurer for the queen of Ethiopia who had made a trip to Jerusalem to worship in the temple. But the most scandalous, most shocking thing about him was his lack of gender.
He was a eunuch.