Ali-Name”, a poem whose poet’s identity is unclear and is known by the pseudonym “Rabi”, is versed in the 482 (AH) and is the oldest Shiite well written poem. Shafiei Kadkani wrote a great introduction for it and presented it to the scientific community. Although many researchers in the field of Persian literature have paid great attention to it, but due to the content of the poem which displays the courage and bravery of imam Ali in the battles of Jamal and Saffein, based on the narratives of the renowned historian, Abu Mokhanaf (157 AD), it has a historical importance as well. What is important in the first phase about this old written heritage of Shia is the religion of the poet. What some have written on this subject prove that Rabi was a Shia which could be adjunct to the Ahl-al beyt loving Sunnite. This article proves the Imami Shia religion of the poet by presenting the most important components of the Shia religious ideas and comparing them with the Ali-Name poem.