The following is from the draft english translation of the Arabic book مقدمة الدستور أو الأسباب الموجبة له (Introduction to the constitution and the evidences that make it obligatory) published by Hizb ut-Tahrir 1382 Hijri (1963 CE). Please refer to the original Arabic for accurate meanings. Please note some of the adopted opinions of the Hizb have changed since the time the book was published so any of the adopted literature published after this book which contradicts what is mentioned in this book abrogates those specific points. The only considerable evidences of the Shari'ah rules are the Book, the Sunnah, the Ijma'a of the Sahaba and the Qyyas (analogy). Explanation and evidences: This article does not imply that the State will adopt a method of Ijtihad, it rather means that the State will adopt and follow a specific method of Ijtihad; it rather means that the State will follow a specific method when adopting the Shari'ah rules; because the adoption of the Shari'a
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