Ibn al-Khattab
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. They also cited the dinar’s mention in the Qur'an, 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".