A.T. Robertson Commentary Acts 8:25

"They therefore, when they had testified and spoken the word of the Lord, returned to Jerusalem, and preached the gospel to many villages of the Samaritans." — Acts 8:25 (ASV)

They therefore (ο μεν ουν). Demonstrative ο with μεν (no following δε) and the inferential ουν (therefore) as often in Acts (1:6, etc.).

Returned (υπεστρεφον). Imperfect active picturing the joyful journey of preaching (ευηγγελιζοντο, imperfect middle) to the Samaritan villages. Peter and John now carried on the work of Philip to the Samaritans. This issue was closed.