Hadith 1648 - Bab 298 (Prohibition of using the right hand for cleaning after toilet without a valid reason)
Chapter 18 (The Book of the Prohibited actions)

Abu Qatadah (May Allah be pleased with him) said: The Prophet (Peace be upon him) 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].

Selon Abou Qatàda (das), le Prophète (bsdl) a dit: «Quand l"un de vous urine, qu"il ne tienne pas son organe avec sa main droite, qu"il ne se lave pas les émonctoires avec la main droite et, quand il boit, qu"il ne respire pas dans le récipient».