Yahya related to me from Malik from Nafi from Aslam, the mawla ofUmar ibn al-Khattab, that Umar ibn al-Khattab imposed a jizya tax offour dinars on those living where gold was the currency, and fortydirhams on those living where silver was the currency. In addition,they had to provide for the muslims and receive them as guests forthree days.
USC-MSA web (English) reference: Book 17, Hadith 44
Arabic reference: Book 17, Hadith 620