Charles Ellicott Commentary Acts 8:14

"Now when the apostles that were at Jerusalem heard that Samaria had received the word of God, they sent unto them Peter and John:" — Acts 8:14 (ASV)

When the apostles who were at Jerusalem. . . .—The news came to the Twelve as a proof that the limitation which had initially excluded Samaria from the scope of their work as preachers of the kingdom had now passed away (Matthew 10:5), and that the time had now come when they were to be witnesses to Christ in Samaria as well as in Judea (Acts 1:8).

Old antipathies of race and worship disappeared, and without hesitation they sent the two who were, in many respects, the chief of the Apostles to sanction the admission of the new converts. The Apostle who in his zeal had once sought to call down the fire of the wrath of God on the village of the Samaritans (Luke 9:54), was now to bring to them that baptism of the Holy Ghost and of fire (Matthew 3:11) which spoke not of wrath but of love. That his companion should be Peter was natural, both from the position which the latter occupied as the leader of the apostolic company and from the friendship by which the two had been united throughout their lives.

The word of God is characteristically used by St. Luke, as in his Gospel, for the whole sum and substance of the gospel of Christ (Luke 8:11; Luke 8:21).