Genesis 11:1

The whole earth had a common language and a common vocabulary.

Zephaniah 3:9

Know for sure that I will then enable the nations to give me acceptable praise. All of them will invoke the Lord's name when they pray, and will worship him in unison.

Acts 2:6

When this sound occurred, a crowd gathered and was in confusion, because each one heard them speaking in his own language.

Isaiah 19:18

At that time five cities in the land of Egypt will speak the language of Canaan and swear allegiance to the Lord who commands armies. One will be called the City of the Sun.

Treasury of Scripture Knowledge

Summary

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

Bible References

Was

Isaiah 19:18
At that time five cities in the land of Egypt will speak the language of Canaan and swear allegiance to the Lord who commands armies. One will be called the City of the Sun.
Zephaniah 3:9
Know for sure that I will then enable the nations to give me acceptable praise. All of them will invoke the Lord's name when they pray, and will worship him in unison.
Acts 2:6
When this sound occurred, a crowd gathered and was in confusion, because each one heard them speaking in his own language.

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