The biblical accounts do not specify a gift of language to man. No doubt they imagine that man shares it with God and the animals. In Athra-hasis, language appears as an ambiguous gift bestowed upon man by the gods.
So, according to the biblical account, there was originally a common language understood by men, God and animals. There is no theory as to the origin of this unique language; we could say that, according to the priestly author, it originated in the word of the creator god. Here, too, the flood marks a turning point, since after the deluge, mankind will differentiate and speak several languages.
Language differentiation goes hand in hand with the settlement of human groups in different places. Between Gen 9 and 11, the Hebrew Bible has preserved three contradictory accounts: Gen 9:18-27 ("Noah's drunkenness"), which introduces a separation and hierarchy among Noah's sons; Gen 10 ("the table of nations") and, in Gen 11:1-9, the story of the "Tower of Babel". The most neutral text is that of Gn 10: a genealogical list with an impressive number of names, some of which still resist explanation. In its present form, the text is confusing; it becomes less so when we realize that, in this form, it combines "P" and non-P elements.