Genesis 11:9

1. Now the sons of Noah were three, - Shem, Japhet, and Ham, born one hundred years before the Deluge. These first of all descended from the mountains into the plains, and fixed their habitation there; and persuaded others who were greatly afraid of the …

It is likely that they lost their common language when they received these new languages. For if their original language had not perished their first deed would not have come to nothing.

There are many people even today who in imitation of them want to be remembered for such achievements, by building splendid homes, baths, porches and avenues. I mean, if you were to ask each of them why they toil and labor and lay out such great expense to no good purpose, you would hear nothing but these very words. They would be seeking to ensure that their memory survives in perpetuity and to have it said that "this is the house belonging to so-and-so," "this is the property of so-and-so." This, on the contrary, is worthy not of commemoration but of condemnation. For hard upon those words come other remarks equivalent to countless accusations—"belonging to so-and-so the grasping miser, despoiler of widows and orphans." So such behavior is calculated not to earn remembrance but to encounter unremitting accusations, achieve notoriety after death and incite the tongues of onlookers to calumny and condemnation of the person who acquired these goods. But if you are anxious for undying reputation, I will show you the way to succeed in being remembered for every achievement and also, along with an excellent name, to provide yourself with great confidence in the age to come. How then will you manage both to be remembered day after day and also become the recipient of tributes even after passing from one life to the next? If you give away these goods of yours into the hands of the poor, letting go of precious stones, magnificent homes, properties and baths.

AGAIN, whereas Moses wrote an account of the building of the tower, and how from one language men passed into the confusion of many dialects, the author just before mentioned, in his work entitled Of Assyrian History, bears the like testimony, speaking as follows: [ABYDENUS] 'But there are some who say that the men who first arose out of the earth, being puffed up by their strength and great stature, and proudly thinking that they were better than the gods, raised a huge tower, where Babylon now stands: and when they were already nearer to heaven, the winds came to the help of the gods, and overthrew their structure upon them, the ruins of which were called Babylon. And being up to that time of one tongue, they received from the gods a confused language; and afterwards war arose between Cronos and Titan. [JOSEPHUS] 'And the place in which they built the tower is now called Babylon, because of the confusion of what at first was clear in their language. For the Hebrews call confusion "Babel."

And if any one cites the confusion of tongues that took place at the building of the tower, as contradicting what I have said, not even there is God spoken of as creating men's languages, but as confounding the existing one, that all might not hear all. For when all lived together and were not as yet divided by various differences of race, the aggregate of men dwelt together with one language among them; but when by the Divine will it was decreed that all the earth should be replenished by mankind, then, their community of tongue being broken up, men were dispersed in various directions and adopted this and that form of speech and language, possessing a certain bond of union in similarity of tongue, not indeed disagreeing from others in their knowledge of things, but differing in the character of their names. For a stone or a stick does not seem one thing to one man and another to another, but the different peoples call them by different names. So that our position remains unshaken, that human language is the invention of the human mind or understanding. For from the beginning, as long as all men had the same language, we see from Holy Scripture that men received no teaching of God's words, nor, when men were separated into various differences of language, did a Divine enactment prescribe how each man should talk. But God, willing that men should speak different languages, gave human nature full liberty to formulate arbitrary sounds, so as to render their meaning more intelligible.