Moses
Genesis 11:1BSB·traditional attribution

Now the whole world had one language and a common form of speech.

John Calvin Reformed @genevareformer

1. And the whole earth was of one language . Whereas mention had before been made of Babylon in a single word, Moses now more largely explains whence it derived its name. For this is a truly memorable history, in which we may perceive the greatness of men’s obstinacy against God, and the little profit they receive from his judgments.

Matthew Henry Presbyterian @wholebiblehenry

The close of the foregoing chapter tells us that by the sons of Noah, or among the sons of Noah, the nations were divided in the earth after the flood, that is, were distinguished into several tribes or colonies; and, the places having grown too strait for them, it was either appointed by Noah, or agreed upon among his sons, which way each several tribe...

Commenting on Genesis 11:1-4

John Gill Reformed Baptist @doctorgill

And the whole earth was of one language, and of one speech,.... Or had been (w), before the flood, and from that time to this, and still was, until the confusion took place; the account of which, and the occasion of it, are given in this chapter: by the whole earth is meant the inhabitants of it, see Isa 37:18 and so the Jerusalem Targum...