Fatâwah ar-Riđawiyyah, vol. 23, pp. 690 Kya farmāte hai[n] Úlamā-e dīn is mas’ale ke: ‘ilm-e dīn haasil karna wājib hai, farz hai ya sunnat? Farz ‘ayn ka ‘ilm haasil karna, farz ‘ayn, farz Kifāyah ka farz Kifāyah, wājib ka wājib, mustahab ka mustahab, wAllahu Ta’āla a’lam