Many Pentecostal traditions teach that speaking in tongues is the definitive sign of being baptized with the Holy Spirit. This baptism or filling of the Spirit happens sometime after your conversion and is known as the “Second Blessing”. Every Spirit-filled believer, they would argue, should therefore speak in tongues.
Pentecostals often refer to and preach from Acts 19:1-6 to promote second blessing theology (SBT). SBT teaches that the normative Christian practice is first to accept Jesus as Lord and then, secondly, to have another separate, distinct experience of the baptism of the Spirit. During this second experience the Christian is said to be filled with the Spirit, normally this “blessing” is accompanied with speaking in “tongues”.
In Ephesus Paul found twelve “disciples” (v1). Normally in Acts “disciples” refers to Christians, but it turns out from Paul’s questioning that these people are not Christians, but repentant Jews. Paul probably thought they were Christians at first.
To gauge their spiritual state, Pauls asks (v2), “Did you receive the Holy Spirit when you believed?” Paul did not ask did you receive the Spirit when you attended the course or when you prayed a special prayer or when you truly entered a new level of obedience in your Christian life! Paul associates receiving the Holy Spirit with believing (i.e. believing in Jesus).