One of the evidences that one has received the Holy Spirit is speaking in tongues. Mark 16:17.
Glossolalia which means speaking in angelic tongues was first recorded in Acts 2 when the disciples received the Holy Spirit and it was described as a miracle during Pentecost.
“They were all filled and equipped with the Holy Spirit and were inspired to speak in tongues—empowered by the Spirit to speak in languages they had never learned!”
Acts 2:4 TPT