Abdur Rahman bin Mahdi عبد الرحمن بن مهدي · The Book of Purification and its Sunnah

"The Messenger of Allah said: 'The deeds connected to the Fitrah are five (or five things are connected to the Fitrah): circumcision, shaving the pubic hairs, clipping the nails, plucking the armpit hairs and trimming the mustache.'"

"The Messenger of Allah said: 'These Hushush (waste areas) are visited (by devils), so when anyone of you enters, let him say: 'Allahumma inni a`udhu bika minal-khubthi wal-khaba'ith (O Allah, I seek refuge with You from male and female devils).'" (Sahih) Other chains with similar wording.

"I heard 'Uthman bin 'Affan say: 'I never sang a song or told a lie or touched my penis with my right hand after I swore on oath of allegiance to the Messenger of Allah to that effect.'"

"The Messenger of Allah said: 'Perform ablution after (eating) that which has been changed by fire.'"

A man asked him: "How much water should I pour over my head when I m sexually impure?" He said: "the messenger of Allah used to pour three handfuls of water over his head." The man said: "My hair is long." He said: "The Messenger of Allah had more hair than you and he was cleaner."

"I said, O Messenger of Allah! I am a woman with tight braids. Should I undo them when I take a bath to cleanse myself from the state of sexual impurity?" He said: "Rather it is sufficient for you to pour three handfuls of water over yourself, and you will be purified," or he said: "In that case you would have become purified."