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1 And the whole earth was of one language, and of one speech.
2 And it came to pass, as they journeyed from the east, that they found a plain in the land of Shinar; and they dwelt there.
3 And they said one to another, Go to, let us make brick, and burn them throughly. And they had brick for stone, and slime had they for morter.
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.
8 So the LORD scattered them abroad from thence upon the face of all the earth: and they left off to build the city.
9 Therefore is the name of it called Babel; because the LORD did there confound the language of all the earth: and from thence did the LORD scatter them abroad upon the face of all the earth.
Genesis 11:1 claims that prior to the event, humanity spoke a single language. In the confusion of tongues, this language was split into seventy or seventy-two dialects, depending on tradition. This has sometimes been interpreted as being in contradiction to Genesis 10:5:
There are several mediaeval historiographic accounts that attempt to make an enumeration of the languages scattered at the Tower of Babel. Because a count of all the descendants of Noah listed by name in chapter 10 of Genesis (LXX) provides 15 names for Japheth's descendants, 30 for Ham's, and 27 for Shem's, these figures became established as the 72 languages resulting from the confusion at Babel — although the exact listing of these languages changed over time. (The LXX Bible has two additional names, Elisa and Cainan, not found in the Masoretic text of this chapter, so early rabbinic traditions, such as the Mishna, speak instead of "70 languages".) Some of the earliest sources for 72 (sometimes 73) languages are the 2nd-century Christian writers Clement of Alexandria (Stromata I, 21) and Hippolytus of Rome (On the Psalms 9); it is repeated in the Syriac book Cave of Treasures (c. 350 CE), Epiphanius of Salamis' Panarion (c. 375) and St. Augustine's The City of God 16.6 (c. 410). The chronicles attributed to Hippolytus (c. 234) contain one of the first attempts to list each of the 72 peoples who were believed to have spoken these languages.
The above from: https://en.wikipedia.org/wiki/Tower_of_Babel
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