Hammad ibn Abi Sulayman (died 738 CE) was an early Kufan Muslim jurist who is best known for being the principal teacher of Abu Hanifa, the eponym of the Hanafi school of law.
Biography The extant biographical information about Hammad is limited. It is known that he was a mawla (client) of the family of Abu Musa al-Ash'ari, a companion of Muhammad. His father was wealthy, allowing Hammad to dedicate himself solely to his legal studies. He became the student of Ibrahim al-Nakha'i in Kufa, who appears to have been his sole mentor in fiqh,Hanif 2018, p. 187 although he also studied under al-Sha'bi and met Hasan al-Basri, Said ibn al-Musayyib and the companion Anas ibn Malik. He began issuing legal verdicts during al-Nakha'i's lifetime and inherited his halaqa (study circle) following his death in 714.
The jurisprudence of Hammad focused on ra'y and understanding the underlying causes ('illah) of rulings, following al-Nakha'i in this regard. Various accounts describe crowds mocking Hammad for his use of legal analogy (qiyas).Shahawy 2019, pp. 18-19
Abu Hanifa attended the halaqa of Hammad for eighteen to twenty years and eventually, due to his ability, was afforded the privilege of sitting directly in front of Hammad. The isnad of Abu Hanifa – Hammad – al-Nakha'i is regarded as the "golden Kufan chain".Shahawy 2019, p. 85 Hammad died in Kufa in 738. Abu Hanifa led his halaqa thereafter, and named his son Hammad in tribute to his teacher.Shahawy 2019, p. 213
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Hanif, S. (2018). A Tale of Two Kufans: Abū Yūsuf’s Ikhtilāf Abī Ḥanīfa wa-Ibn Abī Laylā and Schacht’s Ancient Schools. Islamic Law and Society, 25(3), 173–211. Shahawy, H. (2019). How subjectivity became wrong: early Hanafism and the scandal of Istihsan in the formative period of Islamic law (750-1000 CE) [PhD thesis]. University of Oxford.