Jamieson, Fausset and Brown on Acts 8:25

25. and they--Peter and John.

when they had ... preached--in the city where Philip's labors had been so richly blessed.

returned ... and preached ... in many villages of the Samaritans--embracing the opportunity of their journey back to Jerusalem to fulfil their Lord's commission to the whole region of Samaria (Ac 1:8).

Ac 8:26-40. The Ethiopian Eunuch.

"With this narrative of the progress of the Gospel among the Samaritans is connected another which points to the diffusion of the doctrine of the Cross among the remotest nations. The simplicity of the chamberlain of Meroe forms a remarkable contrast with the craft of the magician just described" [Olshausen].