Isaiah 36:11

the Syrian(or Aramean R.V. marg.) language was the medium of international communication in Western Asia, more especially of commerce. Assyrian on the other hand was a barbarous tongue to the Hebrews (ch. Isaiah 28:11; Isaiah 33:19).

the Jews" language Hebrew is so called only in one other (post-Exilic) passage, Nehemiah 13:24.