1)The first mention is in the Venidad Chapter 1 verse 19. It mentions that out of the sixteen countries the fifteenth one is the Hapta Hindu country.
In Firdousi’s Shah Nameh circa 1000 A. D. where there is a description of the war between Iran and Turan (Central Asia north of Afghanistan),
The Iranians and then the Greeks after them had a clear idea of the existence of India in ancient times. The preponderance of evidence supports Shonaleeka.