But when they believed Philip - So it is evident that Philip's word came with greater power then that of Simon; and that his miracles stood the test in such a way as the feats of Simon could not.

But when they believed Philip,.... Though they had been carried away so long with this deceiver, and had been so much attached unto him, and held in admiration of him; yet when Philip came and preached Christ unto them, such was the power that attended his ministry, and such the efficacy of divine grace that was exerted, that they not only gave heed unto him, but believed what he said:

preaching the things concerning the kingdom of God; concerning the kingdom of the Messiah, the Gospel dispensation, the doctrines and ordinances of the Gospel; and concerning the kingdom of grace, which is spiritual and internal, and which lies not in external things, as meat and drink, but in righteousness, peace, and joy; and concerning the kingdom of glory, the meetness for it, which lies in regenerating grace, and the right unto it, which is the righteousness of Christ:

and the name of Jesus Christ; concerning the person of Christ, as the Son of God: and the offices of Christ, as prophet, priest, and King; and the virtue of his blood, righteousness, and sacrifice, for pardon, justification, and atonement: the Vulgate Latin, Syriac, and Ethiopic versions read this clause, "in the name of Jesus Christ": and connect it with the following words,

they were baptized, both men and women: that is, when, they heard Philip preach the Gospel, and believed in Christ, the sum and substance of it, and made a profession of faith, they were of each sex, both men and women, baptized by immersion, in the name of Jesus Christ.

But when they believed Philip preaching the things concerning the kingdom of God, and the name of Jesus Christ, they were baptized, both men and women.

8:12 When they believed Philip. This verse states in the concisest manner the apostolic order of converting men: (1) Philip preached; (2) he preached the kingdom and name of Jesus Christ; (3) faith came by hearing, for the Samaritans believed; (4) when they believed they were baptized. This describes the uniform course in apostolic days.

Both men and women. Note that (1) only believers are baptized, (2) that men and women are both included, but children are not named.

8:12 But when they believed - What Philip preached, then they saw and felt the real power of God, and submitted thereto.

12. were baptized, both men and women-the detection of Simon's frauds helping to extend and deepen the effects of Philip's preaching.

8:5-13 As far as the gospel prevails, evil spirits are dislodged, particularly unclean spirits. All inclinations to the lusts of the flesh which war against the soul are such. Distempers are here named, the most difficult to be cured by the course of nature, and most expressive of the disease of sin. Pride, ambition, and desire after grandeur have always caused abundance of mischief, both to the world and to the church. The people said of Simon, This man is the great power of God. See how ignorant and thoughtless people mistake. But how strong is the power of Divine grace, by which they were brought to Christ, who is Truth itself! The people not only gave heed to what Philip said, but were fully convinced that it was of God, and not of men, and gave up themselves to be directed thereby. Even bad men, and those whose hearts still go after covetousness, may come before God as his people come, and for a time continue with them. And many wonder at the proofs of Divine truths, who never experience their power. The gospel preached may have a common operation upon a soul, where it never produced inward holiness. All are not savingly converted who profess to believe the gospel.