Ubaidullah bin 'Umar bin Hafs عبيد الله بن عمر بن حفص بن عاصم · The Book of Purification

"Trim the mustache and let the beard grow."

"I said to Ibn 'Umar: 'I see you are wearing Sibtiyyah sandals, and you performed Wudu' in them.' He said: 'I saw the Messenger of Allah (ﷺ) wearing then and performing Wudu' in them.'" Made of hairless, tanned leather.

"I remember lying in front of the Messenger of Allah (ﷺ), and the Messenger of Allah (ﷺ) was praying. When he wanted to prostrate he would nudge my foot and I would draw it up (out of the way) until he had finished prostrating."

"I noticed the Prophet (ﷺ) was not there one night, so I started looking for him with my hand. My hand touched his feet and they were held upright, and he was prostrating and saying: 'I seek refuge in Your pleasure from Your anger, in Your forgiveness from Your punishment, and I seek refuge in You from You. I cannot praise You enough, You are as You have praised yourself.'"

"Umar mentioned to the Messenger of Allah (ﷺ) that he became Junub at night, and the Messenger of Allah (ﷺ) said: 'Perform Wudu' and wash you penis, then sleep.'"