Mishkat al-Masabih #315
Purification
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي قَتَادَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «إِذا شرب أحدكُم فَلَا ينتنفس فِي الْإِنَاءِ وَإِذَا أَتَى الْخَلَاءَ فَلَا يَمَسَّ ذَكَرَهُ بِيَمِينِهِ وَلَا يَتَمَسَّحْ بِيَمِينِهِ»
Abu Qatada reported God’s messenger as saying, "When one of you drinks he must not breathe into the vessel, and when he goes to relieve himself he must not touch his penis with his right hand, or wipe himself with his right hand.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #315 from Mishkat al-Masabih, in the Book of Purification.