Muhammad bin 'Abdullah bin al-Zubair محمد بن عبد الله أبو أحمد الزبيري · The Book on Purification

"A man greeted the Prophet (with Salam), and he was urinating, so he did not respond to him."

AlIah's Messenger said: "Pure clean earth is a purifier for the Muslim; even if he did not find water for ten years. Then if he finds water, then let him use it (for purification) on his skin. For, that is better."

"Allah's Messenger would go around to his women with one Ghusl."