Abu Qatada ibn Rab'i · The Book of Purification

The Messenger of Allah (ﷺ) said: None of you should hold penis with his right hand while urinating, or wipe himself with his right hand in privy and should not breathe into the vessel (from which he drinks).

When anyone amongst you enters the privy he should not touch his penis with his right hand.

"When any one of you urinates, let him not hold his penis in his right hand."

"The Messenger of Allah (ﷺ) said: 'When any one of you enters Al-Khala' (the toilet), let him not touch his penis with his right hand.'"

"When any one of you drinks, let him not breathe into the vessel, and when he goes to the toilet let him not touch his penis with his right hand, nor wipe himself with this right hand."