What does the Bible teach about speaking in tongues?

The phenomenon of speaking in tongues, as recorded in Acts 2, refers specifically to the supernatural ability to communicate the gospel in languages not previously learned by the speaker. This serves as a sign gift to authenticate the message of salvation to diverse ethnic groups, illustrating the inclusivity of the gospel. Contrary to modern interpretations, this biblical gift was intended as a means of clear communication, not ecstatic utterance devoid of meaning. Understanding this distinction is crucial, as it aligns the practice of spiritual gifts with the purpose of edifying the church and advancing the Great Commission.