When the apostles in Jerusalem heard that Samaria had received the word of God, they sent Peter and John to them.
In context
12But when they believed Philip as he announced the good news of the kingdom of God and the name of Jesus Christ, they were baptized, men and women alike. 13Simon himself believed as well; and after his baptism he stayed close to Philip, astonished at the signs and the great acts of power he saw taking place. 14When the apostles in Jerusalem heard that Samaria had received the word of God, they sent Peter and John to them. 15The two went down and prayed for them, that they might receive the Holy Spirit; 16for the Spirit had not yet come upon any of them — they had only been baptized into the name of the Lord Jesus.