"Yahya related to me from Malik from Nafi from Aslam, the mawla of Umar ibn al-Khattab, that Umar ibn al-Khattab imposed a jizya tax of four dinars on those living where gold was the currency, and forty dirhams on those living where silver was the currency. In addition, they had to provide for the muslims and receive them as guests for three days."