This document provides an overview of the rules and classifications of purity (tahara) in Islamic jurisprudence according to the book Fiqh Us Sunnah. It discusses the different types of water and their purity status, including rainwater, sea water, well water, and water mixed with pure or impure substances. It also covers leftover water and the purity implications of various animals drinking from a container. Dead animals and their classification are explained as well as other impure substances. The document aims to comprehensively outline the rulings on purity in the Islamic legal tradition.