Genesis 11:1

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

Zephaniah 3:9

For then I will give a clear lip to the people, to call all of them by the name of Jehovah, to serve Him with one shoulder.

Acts 2:6

But this sound occurring, the multitude came together and were confounded, because they each heard them speaking in his own dialect.

Isaiah 19:18

In that day five cities in the land of Egypt shall speak the language of Canaan and swear to Jehovah of Hosts; one shall be called the City of Ruin.

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 Jehovah of Hosts; one shall be called the City of Ruin.
Zephaniah 3:9
For then I will give a clear lip to the people, to call all of them by the name of Jehovah, to serve Him with one shoulder.
Acts 2:6
But this sound occurring, the multitude came together and were confounded, because they each heard them speaking in his own dialect.