Prinsip keempat menyatakan bahawa Khalifah ialah satu-satunya badan yang mempunyai kuasa wajib untuk mengambil pakai undang-undang dan perundangan. Perkara ini telah dibuktikan melalui ijmak umum para Sahabat (Ijmaa'). Berdasarkan ijmak ini, prinsip-prinsip Shari'ah berikut telah diperoleh: "Pendapat Imam menyelesaikan perselisihan"; "Pendapat Imam adalah mengikat"; "Sultan (Imam) berhak mengambil pakai undang-undang baharu bagi setiap perkara baharu yang timbul".

The fourth principle, states that the Khaleefah is the sole body with mandatory powers to adopt laws and legislation. This has been proved by the general consensus of the Sahabah (Ijmaa’). Following this consensus these Shari’ah principles have been derived: “The opinion of the Imam settles the difference”; “The opinion of the Imam is binding”; “The Sultan (Imam) reserves the right to adopt new laws for as many new matters that arise”.

Ini akan dijelaskan kemudian bersama dalilnya, dalam bab tentang kuasa-kuasa wajib bagi Khalifah.

This will be explained later on together with its proofs, in the chapter on the mandatory powers of the Khaleefah.