The First Indication: On the Inward Meaning of Purification, which is the first of the pillars of Prayer:

Know, O brother—may Allah the Exalted purify you from the filths of doubt—that Purification (Taharah) is the opposite of Impurity (Najasah) in general custom. Purification, therefore, is the removal of manifest impurity from the outward body using pure water. The meaning of pure water in legal custom is the absence of any mixture that changes one of its three attributes—its taste, color, or smell—from the state it was known for in its flow or stagnation.

The impurity that must be removed from the body with water is divided into two categories: Customary and Legal.

The Customary includes feces, urine, and all other dirts of the body.

The Legal includes Janaba (major ritual impurity), which necessitates water and its pouring over the entire body and its parts reached by the sky, and Hadath (minor ritual impurity), which necessitates Ghusl [referring here to the specific washing of Wudu]—which is the washing of the specific limbs and the intended parts for every Muslim upon the intention to enter Prayer, according to the saying of the Exalted:

{O you who have believed, when you rise to [perform] prayer, wash your faces and your forearms to the elbows and wipe over your heads and wash your feet to the ankles. And if you are in a state of janaba, then