Acts 8:5

5. Among the many who now went everywhere preaching the word, the historian chooses to relate here the labors of only one. (5) "Then Philip went down into the city of Samaria and preached Christ to them." This Philip was one of the seven, and his name stands in the list next to that of Stephen. The reason why Luke selects his labors for this place in the history, is because he was the first to preach the gospel in Samaria. Jesus had commanded them to testify first in Jerusalem; then in Judea; then in Samaria; and then to the uttermost part of the earth. Luke follows them in the regular prosecution of this programme.