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In page Murabitun World Movement:

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Abdalqadir as-Sufi's advocacy of Malik’s school of Madinah is explained at length in his work Root Islamic Education. The Murabitun do not, however, in any way dispute the validity of the other legal schools,[1] nor is adherence to or advocacy of the madhhab of Malik a condition of membership of the Murabitun.