Acts 8:15
Who, when they were come down, prayed for them, that they might receive the Holy Ghost:
Cross-reference
In Acts 8:5, Philip preaches in Samaria, leading to conversions — then Peter and John pray for the Spirit in 8:15.
Acts 19:2 parallels this: Paul asks believers if they received the Holy Spirit — a similar delay between belief and Spirit reception after baptism.
In Acts 10:44, the Spirit falls spontaneously without prayer — contrasting with the deliberate prayer here for the Spirit.
Acts 2:38 promises the Holy Spirit to repentant believers; here the Samaritans believed but needed apostolic prayer to receive the Spirit.
In Numbers 27:18, Moses lays hands on Joshua, who has the spirit — a typology of apostolic laying on of hands for the Spirit.
Galatians 3:2 asks how the Spirit is received — by faith, not works — illuminating the principle behind the Samaritan believers' reception here through prayer.
In John 20:22, Jesus directly breathes the Spirit on disciples — here the apostles pray for the Spirit to come upon Samaritans.
In Philippians 1:19, Paul links prayer and the Spirit's help — here the apostles pray for the Spirit to come upon believers.