Salman al-Farisi (Arabic: سَلْمَان ٱلْفَارِسِيّ, romanized: Salmān al-Fārisī) was a Persian companion of Muhammad. He was raised as a Zoroastrian in the Sasanian Empire, then was attracted to Christianity, and then converted to Islam after meeting Muhammad in the city of Yathrib, which later became Medina. During some of his later meetings with the other companions, he was referred to by the kunyah Abu ʿAbdullah "Father of Abdullah".
 At his suggestion, a trench was dug (a Sasanian military technique) around Medina when it was attacked by the Meccan Quraysh in the Battle of the Trench. According to some traditions, he was appointed as the governor of Al-Mada'in in Iraq, and in popular tradition, Muhammad considered Salman as being part of his household. He was a follower of Muhammad's cousin Ali after the death of Muhammad.
 The date and place of Salman's birth are disputed. According to the evidence, his date of birth should be between 531 and 570 AD.
Salman was a Persian born with the name Rouzbeh Khoshnudan in the city of Kazerun in Fars Province, or Isfahan in Isfahan Province. In a hadith, Salman also traced his ancestry to Ramhormoz. The first sixteen years of his life were devoted to studying to become a Zoroastrian magus or priest, after which he became the guardian of a fire temple. Three years later in 587 he met a Nestorian Christian group and was impressed by them. Against the wishes of his father, he left his family to join them. His family imprisoned him afterwards to prevent him but he escaped.
 Salman traveled around the Middle East to discuss his ideas with priests, theologians and scholars in his quest for the truth, settling initially in Mosul (ancient Nineveh). During his stay in Syria, he heard of Muhammad, whose coming had been predicted by Salman's last Christian teacher on his deathbed. Afterwards and during his journey to the Arabian Peninsula, he was betrayed and sold to a Jew in Medina. After meeting Muhammad, he recognized the signs that the monk had described to him. He converted to Islam and secured his freedom with the help of Muhammad.Salman is the first Iranian who converted to Islam. According to sources, Salman converted to Islam before the Battle of Badr, but because he was a slave before the Battle of Khandaq, he did not participate in the Battles of Badr andUhud.
 Abu Hurairah is said to have referred to Salman as "Abu al-Kitabayn" ("the father of the two books"; that is, the Bible and the Quran), and Ali is said to have referred to him as "Luqman al-Hakeem" ("Luqman the wise," a reference to a wise man mentioned in the Quran). Whenever people inquired about his ancestry, Salman is said to have replied: "I am Salman, the son of Islam from the child of Adam."
 Salman came up with the idea of digging a great trench around the Medina, to defend the city against the army of 10,000 Arabian non-Muslims. Muhammad and his companions accepted Salman's plan because it was safer, and there would be a better chance that the non-Muslim army would have a larger number of casualties.
 While some sources gather Salman with the Muhajirun, other sources narrate that during the Battle of the Trench, one of Muhajirun stated "Salman is one of us, Muhajirun", but this was challenged by the Muslims of Medina (also known as the Ansar). A lively argument began between the two groups with each of them claiming Salman belonged to their group and not to the other one. Muhammad arrived on the scene and heard the argument. He was amused by the claims but soon put an end to the argument by saying: "Salman is neither Muhajir nor Ansar. He is one of us. He is one of the People of the House."
 Salman participated in the conquest of the Sasanian Empire, and became the first governor of Sasanid capital Ctesiphon, after its fall at the time of the second Rashidun Caliph, Umar ibn Al-Khattab. However, according to some other sources, after Muhammad's death, he disappeared from public life until 656, when Ali became the Caliph, and appointed Salman as the governor of Al-Mada'in at the age of 88.
 He translated the Quran into Persian, thus becoming the first person to interpret and translate the Quran into a foreign language. Salman is said to have written the following poem on his enshrouding cotton:
 Salman used to cut the hair of Muhammad at the time, inspiring plates in Turkish barber shops with the verse:
 Salman is considered one of the pioneers in Shiite written works. In addition, written works have also been attributed to him. Including a work called "Khobar Jathliq al-Roumi".
Of course, this work is a text that Salman only narrated and was not the author of. "Khabar Jathliq Rumi" contains the theological questions of the Roman emperor to the Caliph of the Muslims after the death of the Prophet Muhammad and Ali's answer to those questions. Ibn Babawiyah quoted three parts of it and at the end of the second and third quotations he pointed out that the full text of Salman's book is at the end of the book Prophethood has been brought.
 One source states that he died in 32 A.H. / 652 or 653 C.E. in the Julian calendar. while another source says he died during Uthman's era in 35 A.H. / 655 or 656 C.E. Other sources state that he died during Ali's reign. His tomb is located in Salman Al-Farsi Mosque in Al-Mada'in, or according to some others, in Isfahan, Jerusalem or elsewhere.
 Shi'ites, Twelvers in particular, hold Salman in high esteem for a hadith attributed to him, in which all twelve Imāms were mentioned to him by name, from Muhammad. Salman, along with Abu Dharr, Ammar ibn Yasir, and Miqdad ibn Aswad, is considered to be the four loftiest of the Shi'a. Ali Asgher Razwy, a 20th-century Shia Twelver Islamic scholar states:
 If anyone wishes to see the real spirit of Islam, he will find it, not in the deeds of the nouveaux riches of Medina, but in the life, character and deeds of such companions of the Apostle of God as Ali ibn Abi Talib, Salman el-Farsi, Abu Dharr el-Ghiffari, Ammar ibn Yasir, Owais Qarni and Bilal. The orientalists will change their assessment of the spirit of Islam if they contemplate it in the austere, pure and sanctified lives of these latter companions. Salman is also well known as a prominent figure in Sufism. Sufi orders such as Qadiri, Bektashi, and Naqshbandi have Salman in their Isnad of their brotherhood. In the Uwaisi-Shahmaghsoudi order of Kubrawi Sufism and in Naqshbandi Sufism, Salman is the third person in the chain connecting devotees with Muhammad. The members of futuwwa associations also regarded Salman as one of their founders, along with Ali.
 Druze tradition honors several "mentors" and "prophets", and Salman is honored as a prophet, and as an incarnation of the monotheistic idea.
 In the Kitáb-i-Íqán, Bahá'u'lláh honours Salman for having been told about the coming of Muhammad:
 As to the signs of the invisible heaven, there appeared four men who successively announced unto the people the joyful tidings of the rise of that divine Luminary. Rúz-bih, later named Salmán, was honoured by being in their service. As the end of one of these approached, he would send Rúz-bih unto the other, until the fourth who, feeling his death to be nigh, addressed Rúz-bih saying: 'O Rúz-bih! when thou hast taken up my body and buried it, go to Hijáz for there the Day-star of Muhammad will arise. Happy art thou, for thou, shalt behold His face!'