Al-Sayyid Muḥammad Bāqir al-Ṣadr (Arabic: "السید محمد باقر الصدر") (b. 1353/1935, d. 1400/1980) was a Shi'a faqih, exegete of the Qur'an, and a political activist and one of the founders of al-Da'wa political party in Iraq. He was student of Ayatullah Khoei and other great scholars in Najaf. He was also a teacher at the seminary of Najaf. Some of his best-known students are al-Sayyid Muhammad al-Sadr, al-Sayyid Muhammad Baqir al-Hakim, al-Sayyid Kazim al-Husayni al-Ha'iri, and Sayyid Mahmud Hashimi Shahrudi. Later in his life, Sadr was a religious authority for some Shi'a followers. His most significant works are Falsafatuna (Our philosophy), Iqtisaduna (Our economics), and Durus fi 'ilm al-usul (known as Halaqat). Al-Sadr and his sister were finally arrested by the Ba'th regime, and following their imprisonment they were martyred.