Hadith 311
´It was narrated that 'Uqbah bin Suhban said:` "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.'"
Hadith 312
´It was narrated that Abu Hurairah said:` "The Messenger of Allah said: 'When anyone of you cleans himself, he should not clean himself with his right hand. Let him clean himself with his left hand.'"