'Tongues' in the Bible

And there appeared to them parted tongues, as of fire, and it sat upon each one of them.

And they were all filled with the Holy Spirit, and began to speak with other tongues as the Spirit gave to them to speak forth.

Cretans and Arabians, we hear them speaking in our own tongues the great things of God?

for they heard them speaking with tongues and magnifying God. Then Peter answered,

And Paul having laid his hands on them, the Holy Spirit came upon them, and they spoke with tongues and prophesied.