According to the events in Acts, what was the initial evidence of being baptized in the Holy Spirit?

The initial evidence of being baptized in the Holy Spirit, as described in the book of Acts, is speaking in tongues. This phenomenon is prominently featured in Acts 2 during the event of Pentecost, where the apostles were filled with the Holy Spirit and began to speak in other languages as the Spirit enabled them. This ability to speak in tongues was a visible and audible sign of the Holy Spirit's presence and action among the believers, serving as a confirmation of their baptism in the Holy Spirit.

Subsequent passages in Acts continue to illustrate speaking in tongues as a consistent sign associated with receiving the Holy Spirit. Furthermore, it is emphasized in the teachings of the Apostle Paul, who discusses this gift within the broader context of spiritual gifts in the church. Thus, speaking in tongues is foundational to the understanding of the baptism in the Holy Spirit within the Assemblies of God tradition, marking it as a significant and defining experience for believers.