Parshat Noach, 10:31:
These are the sons of Shem, after their families, after their languages, in their lands, after their nations.
אֵלֶּה בְנֵי-שֵׁם, לְמִשְׁפְּחֹתָם לִלְשֹׁנֹתָם, בְּאַרְצֹתָם, לְגוֹיֵהֶם
The posuk after the next one, 11:1:
And the whole earth was of one language and of one speech.
וַיְהִי כָל-הָאָרֶץ, שָׂפָה אֶחָת, וּדְבָרִים, אֲחָדִים
However, the difference between the wording is not addressed there:
What is the difference between שָׂפָה and לָשׁוֹן?