Genesis 11:1

The whole earth was of one language and of one speech.

Zephaniah 3:9

For then I will purify the lips of the peoples, that they may all call on the name of Yahweh, to serve him shoulder to shoulder.

Acts 2:6

When this sound was heard, the multitude came together, and were bewildered, because everyone heard them speaking in his own language.

Isaiah 19:18

In that day, there will be five cities in the land of Egypt that speak the language of Canaan, and swear to Yahweh of Armies. One will 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 will be five cities in the land of Egypt that speak the language of Canaan, and swear to Yahweh of Armies. One will be called "The city of destruction."
Zephaniah 3:9
For then I will purify the lips of the peoples, that they may all call on the name of Yahweh, to serve him shoulder to shoulder.
Acts 2:6
When this sound was heard, the multitude came together, and were bewildered, because everyone heard them speaking in his own language.