“This is an example of the difference between what commentators call the subsequent or the simultaneous receiving of the baptism with the Holy Spirit.
The subsequent view is treasured by Pentecostals & Charismatics. A believer is saved and indwelt by the Spirit at conversion. later he receives the baptism with the Spirit as a separate and distinct experience, usually evidenced by speaking in tongues.
The simultaneous view is rigorously defended by Reformed, Baptist, OPC, PCA, and many others. The Holy Spirit is received fully at the moment of salvation; baptism in the Spirit and salvation are one event.
In about 30 minutes time, all of this will either be cleared up for you, or you will be more confused than ever!”