Wanazuoni wa Kiislamu wamekubaliana kwamba usafi wa kisheria (taharah) una aina mbili: usafi kutoka kwenye hadath (najisi ya kiibada) na usafi kutoka kwenye khabath (najisi ya kimwili).23 24 Pia wamekubaliana kwamba usafi kutoka kwenye hadath una aina tatu: wudhuu, kuoga (ghusl), na mbadala wake, tayammum (kujitwaharisha kwa udongo safi).24 Hii ni kwa sababu ya kujumuishwa kwake katika aya ya wudhuu,25 ambayo ilizungumzia masuala haya. Tutaanza, miongoni mwa haya, kwa mjadala kuhusu wudhuu. Tunasema:

The Muslim jurists agreed that shai*i (legal) purity (tahdra) is of two types: purity from hadath (ritual impurity) and purity from khabath (physical impurity).23 24 They also agreed that purity from hadath is of three kinds: ablution (wudi?), bathing (gZws/), and their substitute, ablution with clean earth (tayammum)?* This is because of their inclusion in the verse of ablution,25 which dealt with these issues. We shall begin, out of these, with a discussion of ablution. We say: