Who said Two nations divided by a common language?

Japheth is traditionally seen as the ancestor of Europeans, as well as some more eastern nations; thus Japhetic has been used as a synonym for Caucasians. Caucasian itself derives in part from the assumption that the tribe of Japheth developed its distinctive racial characteristics in the Caucasus, where Mount Ararat is located. The term Japhetic was also applied by the early linguists (brothers Grimm, William Jones, Rasmus C. Rask and others) to what later became known as the Indo-European language group, on the assumption that, if descended from Japheth, the principal languages of Europe would have a common origin, which apart from Finno-Ugric, Kartvelian, Pontic, Nakh, Dagestan, Hattic, and Basque, appears to be the case. In a conflicting sense, the term was also used by the Soviet linguist Nikolai Marr in his Japhetic theory intended to demonstrate that the languages of the Caucasus formed part of a once-widespread pre-Indo-European language group.