Genesis 11:1-6

1 The whole earth was of one language and of one speech.  2 It happened, as they traveled east, that they found a plain in the land of Shinar; and they lived there.  3 They said one to another, "Come, let's make brick, and burn them thoroughly." They had brick for stone, and they used tar for mortar.  4 They said, "Come, let's build us a city, and a tower, whose top reaches to the sky, and let's make us a name; lest we be scattered abroad on the surface of the whole earth."

5 Yahweh came down to see the city and the tower, which the children of men built.  6 Yahweh said, "Behold, they are one people, and they have all one language; and this is what they begin to do. Now nothing will be withheld from them, which they intend to do.