Genesis 11:1

And the whole earth was of one language and of one speech.

Zephaniah 3:9

For then will I turn to the peoples of a pure language, that they may all call upon the name of Jehovah, to serve him with one consent.

Acts 2:6

And when this sound was heard, the multitude came together, and were confounded, because that every man heard them speaking in his own language.

Isaiah 19:18

In that day there shall be five cities in the land of Egypt that speak the language of Canaan, and swear to Jehovah of hosts; one shall be called The city of destruction.

Treasury of Scripture Knowledge

Summary

And the whole earth was of one language, and of one speech.

Bible References

Was

Isaiah 19:18
In that day there shall be five cities in the land of Egypt that speak the language of Canaan, and swear to Jehovah of hosts; one shall be called The city of destruction.
Zephaniah 3:9
For then will I turn to the peoples of a pure language, that they may all call upon the name of Jehovah, to serve him with one consent.
Acts 2:6
And when this sound was heard, the multitude came together, and were confounded, because that every man heard them speaking in his own language.