Persian (the English word for the language) or Farsi (the Arabic word for the language) or originally Parsi, is the language of Persia or Iran. It is an Indo-European language and is at least 1500 years older than Arabic.

https://www.quora.com/What-are-the-differences-between-Persian-and-Arabic/answer/Abbas-Nderi?ch=10&share=f68e2ce5&srid=3Hmd7