Zabân-e Pâk (Persian: زبان پاک, lit. 'Pure language') is a treatise written in 1944 by Ahmad Kasravi, an Iranian author, contains an edition of the Persian language, which shows some difficulties in refining the language. Kasravi saw one of the steps in the progress of Iran and achieving a democratic society as reforming the Persian language. Zabân-e Pâk was one of the first works that sought to suggest refinements of Persian. Kasravi found dead words of Middle Persian and preferred their use over Arabic loanwords. The movement that Kasravi started, today known as "Sareh Persian", tries to use original Iranian words. Source: Wikipedia (en)