Abu Qatadah (May Allah be pleased with him) said:
The Prophet (ﷺ) said, "Do not touch your private parts with your right hand while urinating, nor for washing or cleaning (your private parts); and do not breathe into the drinking vessel from which you drink."[Al-Bukhari and Muslim].
App reference: Book 18, Hadith 138
Arabic/English book reference: Book 18, Hadith 1648