The Prophet (sallallahu alayhi wa sallam) said: “When one of you drinks, he must not breathe into the vessel.”.
وَعَنْ أَبِي قَتَادَةَ رضى الله عنه
أَنَّ اَلنَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِذَا شَرِبَ أَحَدُكُمْ، فَلَا يَتَنَفَّسْ فِي اَلْإِنَاءِ»
The Prophet (sallallahu alayhi wa sallam) said: “When one of you drinks, he must not breathe into the vessel.”.
صحيح. رواه البخاري (153)، ومسلم (267) واللفظ للبخاري
Who passed it on, from Ibn Hajar back to the one who was there.
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