How the tradition of unknown tongues became entrenched in the English Bibles.
A comparison of six early English Bibles, the Latin and French Bibles on the key-Bible verses that relate to tongues-speaking.
This is a technical comparison. Results and commentary can be found at The Unknown Tongues in the English Bible.
Unknown Tongues, or similar, only occurs in specific passages of the Bible and possibly more. These are the potential ones listed below:
Acts 2:4, 10:46, 19:6, I