Riyad as-Salihin, Book 3, Hadith 765 (In-Book) ⓘ
Abu Sa'id Al-Khudri (May Allah be pleased with him) reported: Messenger of Allah prohibited us blowing in the drinking water. A man said: "O Messenger of Allah! Sometimes I see some litter floating about on the surface. What should I do then?" He replied, "Pour them out." Then the man said: "My thirst is not quenched with one draught." Messenger of Allah said, "Then put away the cup from your mouth (in between three gulps), and take breath." [At-Tirmidhi].
عن أبى سعيد الخدرى رضى الله عنه أن النبي صلى الله عليه وسلم نهى عن النفخ في الشراب، فقال رجل : القذاة أراها في الإناء؟ فقالب: "أهرقها" قال: إني لا أروى من نفس واحد؟ قال: "فأبن القدح إذاً عن فيك" .