Muhammad ibn Abi Bakr
The generation after the death of Muhammad but contemporaries of his companions are known as the Tabi'un, followed by the Tabi‘ al-Tabi‘in. The Caliph Umar ibn Abd al-Aziz set up the influential committee, The Seven Fuqaha of Medina, headed by Qasim ibn Muhammad ibn Abi Bakr. Malik ibn Anas wrote one of the earliest books on Islamic jurisprudence, the "Muwatta", as a consensus of the opinion of those jurists.