Genesis 11:1

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

Zephaniah 3:9

For then will I restore to the people a pure language, that they may all call upon the name of the LORD, to serve him with one accord.

Acts 2:6

Now when this was sounded abroad, the multitude came together, and were confounded, because every man heard them speak in his own language.

Isaiah 19:18

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