It's not only state enforced, it functions also without a state, much like a gang/organized crime And yes you get a death penalty for leaving, reliance of the traveler "a classic manual of islamic sacred law" p. 595 https://www.understandingthethreat.com/wp-content/uploads/2016/08/apostasy-in-reliance-of-the-traveller-768x429.jpg https://en.wikipedia.org/wiki/Reliance_of_the_Traveller Umdat as-Salik wa 'Uddat an-Nasik (Reliance of the Traveller and Tools of the Worshipper, also commonly known by its shorter title Reliance of the Traveller) is a classical manual of fiqh for the Shafi'i school of Islamic jurisprudence. The author of the main text is 14th-century scholar Shihabuddin Abu al-'Abbas Ahmad ibn an-Naqib al-Misri (AH 702-769 / AD 1302–1367). Al-Misri based his work on the previous Shafi'i works of Imam Nawawi and Imam Abu Ishaq as-Shirazi, following the order of Shirazi's al-Muhadhdhab (The Rarefaction) and the conclusions of Nawawi's Minhaj at-Talibin (The Seeker's Road). Umdat as-Salik was translated into English by the American Muslim scholar Nuh Ha Mim Keller in 1991 and became the first translation of a standard Islamic legal reference in a European language to be certified by Al-Azhar. The translation comprises 26 sections titled according to the letters of the English alphabet, Book A, Book B, Book C, etc. Books A through C contain introductory material forming a guide to fiqh compiled by Keller. Books D through O correspond to the original work of al-Misri, commencing with an "Author's Introduction". Following are translations of eight shorter works - Books P through V - which address topics such as personal ethics, character, and traditional Islamic Sufism, and include famous classical texts such as Al-Ghazzali's Ihya’ ʿulum al-din and Nawawi's Riyadh as-Saaliheen. Book W consists of extensive notes and appendices, Book X offers thumbnail biographies of hundreds of figures mentioned throughout the work, and Books Y and Z conclude it with a bibliography and indexes. **Certain sections of the book were left untranslated (although the original Arabic text is retained), as Nuh considered them irrelevant to modern societies. These parts include a section on slavery, describing the rights and duties of slaves and their masters, as well as some smaller sections such as, for example, a discussion on fixing utensils using gold.** https://en.wikipedia.org/wiki/Al-Azhar Al-Azhar Mosque (Arabic: الجامع الأزهر‎, romanized: al-Jāmiʿ al-ʾAzhar, lit. 'The Most Resplendent Congregational Mosque'), known simply in Egypt as Al-Azhar, is an Egyptian mosque in Islamic Cairo. Al-Mu'izz li-Din Allah of the Fatimid dynasty commissioned its construction for the newly established capital city in 970. Its name is usually thought to allude to the Islamic prophet Muhammad's daughter Fatimah, a revered figure in Islam who was given the title az-Zahrāʾ ("the shining or resplendent one"). It was the first mosque established in Cairo, a city that has since gained the nickname "the City of a Thousand Minarets".[b] After its dedication in 972, and with the hiring by mosque authorities of 35 scholars in 989, the mosque slowly developed into what is today the second oldest continuously run university in the world after Al Karaouine in Idrisid Fes. Al-Azhar University has long been regarded as the foremost institution in the Islamic world for the study of Sunni theology and sharia, or Islamic law. The university, integrated within the mosque as part of a mosque school since its inception, was nationalized and officially designated an independent university in 1961, following the Egyptian Revolution of 1952. Over the course of its over a millennium-long history, the mosque has been alternately neglected and highly regarded. Because it was founded as a Shiite Ismaili institution, Saladin and the Sunni Ayyubid dynasty that he founded shunned al-Azhar, removing its status as a congregational mosque and denying stipends to students and teachers at its school. These moves were reversed under the Mamluk Sultanate, under whose rule numerous expansions and renovations took place. Later rulers of Egypt showed differing degrees of deference to the mosque and provided widely varying levels of financial assistance, both to the school and to the upkeep of the mosque. Today, al-Azhar remains a deeply influential institution in Egyptian society that is highly revered in the Sunni Muslim world and a symbol of Islamic Egypt.