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In page Murabitun World Movement:

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The Murabitun traced the bi-metallic currency back to Muhammad and the first Muslim community; its specific weights and purities were formally recorded by ‘Umar Ibn al-Khattab.[3][4] They also cited the dinar’s mention in the Qur'an,[5] its use in the universally accepted fiqh to define the terms of zakat, and its mention as currency throughout the entire body of Islamic fiqh. In February 2014, however, Shaykh Dr. Abdalqadir as-Sufi distanced himself from the dinar and dirham movement, saying, "So, I now dis-associate myself from all activity involving the Islamic gold dinar and silver dirham".[6]