Genesis 11:1

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

Zephaniah 3:9

For then I will restore to the peoples the pure language that they may all call upon the name of the LORD to serve him with one consent.

Acts 2:6

Now at this sound, the multitude came together and were confounded because each one heard them speak in his own tongue.

Isaiah 19:18

In that day five cities in the land of Egypt shall speak the language of Canaan and swear to the LORD of the 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 five cities in the land of Egypt shall speak the language of Canaan and swear to the LORD of the hosts; one shall be called The city of destruction.
Zephaniah 3:9
For then I will restore to the peoples the pure language that they may all call upon the name of the LORD to serve him with one consent.
Acts 2:6
Now at this sound, the multitude came together and were confounded because each one heard them speak in his own tongue.