Masnavi

The Masnavi, or Masnavi-ye-Ma'navi (Persian: مثنوی معنوی), also written Mathnawi, or Mathnavi, is an extensive poem written in Persian by Jalal al-Din Muhammad Balkhi, also known as Rumi. The Masnavi is one of the most influential works of Sufism, commonly called "the Quran in Persian". 

It has been viewed by many commentators as the greatest mystical poem in world literature. The Masnavi is a series of six books of poetry that together amount to around 25,000 verses or 50,000 lines.