Genesis 11:5

³  And they said one to another, Go to, let us make brick, and burn them thoroughly. And they had brick for stone, and slime had they for mortar.

⁴  And they said, Go to, let us build us a city and a tower, whose top may reach unto heaven; and let us make us a name, lest we be scattered abroad upon the face of the whole earth.

⁵  And the LORD came down to see the city and the tower, which the children of men builded.

⁶  And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do.

⁷  Go to, let us go down, and there confound their language, that they may not understand one another's speech.