Issue 96: Solid things, into which impurity can not penetrate, if impure, can be purified by walking on or rubbing against earth, provided that the original impurity is removed, earth is pure, and it is not muddy.
Issue 97: Carpets, grass, tarmac and wooden or tiled floor can purify impure things just as does earth.
Issue 98: For the sole of one's impure foot or shoe to be purified, it is not necessary to be wet, and it can be made pure by walking even if it is dry.
Translator’s Preface
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