'Tongues' in the Bible

There appeared to them tongues resembling fire, which were being distributed [among them], and they rested on each one of them [as each person received the Holy Spirit].

And they were all filled [that is, diffused throughout their being] with the Holy Spirit and began to speak in other tongues (different languages), as the Spirit was giving them the ability to speak out [clearly and appropriately].

Cretans and Arabs—we all hear them speaking in our [native] tongues about the mighty works of God!”

For they heard them talking in [unknown] tongues (languages) and exalting and magnifying and praising God. Then Peter said,

And when Paul laid his hands on them, the Holy Spirit came on them, and they began speaking in [unknown] tongues (languages) and prophesying.