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]. (DE)
App reference (DE): Book 18, Hadith 138 (DE)
Arabic/English book reference (DE): Book 18, Hadith 1648 (DE)