Ruling 182 — Purification (Ṭahārah)
Based on obligatory precaution, if the palms or knees of someone who moves around on his hands and knees become impure, they do not become pure as a result of him moving around on them. The same applies to the bottom of a walking stick, the bottom of an artificial leg, the shoe of a quadruped animal, the wheel of a motorcycle or car, and similar things.
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