Salman the Persian or Salman al-Farsi (Arabic: سَلْمَان ٱلْفَارِسِيّ, Salmān al-Fārisīy), born Roozbeh (Persian: روزبه, "good day"), was a companion of the Islamic prophet Muhammad and the first Persian who converted to Islam. During some of his later meetings with the other Sahabah, he was referred to by the kunya Abu Abdullah ("Father of Abdullah"). He is credited with the suggestion of digging a trench around Medina, a Sasanian military technique when it was attacked by Mecca in the Battle of the Trench.
The status of the believers depends on the degree of their knowledge, dedication and submission to the will of Allah (SWT). The degree of Salman is greater than the degree of Abu Tharr as the Hadeeth sated that Salmaan is on the tenth degree of Imaan while Abu Therr is on the ninth degree of Imaan (Al-Khisal by al--Sadouq). Imam Jafar Al-Sadiq (AS) was asked: Why do you repeat mentioning the name of Saman al-Farisi? He replied: Don't say Salman al-Farisi but say Salman al-Muhammadi. Do you know why I repeat mentioning him? For three reasons: First: His love to Ameerul Mo'mineen that he used to avoid what he used to like for the sake of his love to Ameerul Mo'mineen, the second is his love to the poor and choosing them as friends leaving the rich and powerful persons,the third: is his love to the knowledge and knowledgeable (Ulama). (Amaali al-Tousi 83).