The Prophet (sal Allaahu alayhi wa sallam) said: When any one of you urinates, he must not touch his penis with his right hand, and when he goes to relieve himself he must not wipe himself with his right hand (in the privy), and when he drinks, he must not drink in one breath. (Using translation from Abū Dāʾūd 31)
"إذا شَرِبَ أَحَدُكمْ فلا يتنفس في الإِناء، وإذا أتى الخلاءَ فلا يَمَسَّ ذكره بيمينه، ولا يتمسحْ بيمينه.