عروة قالت ذكر رسول الله ﷺ ما يتوضَّأ منه فقال من مسِّ الذكر
سنن النسائي كتاب الغسل والتيمم
‘Urwah said: The Messenger of Allah (SAW) mentioned why you have to do ablution [wudu’]; He said: From touching your penis.
Sunan Al-Nasa’i, The book of washing and dry wiping with dust [tayammum]
