Yahya related to me from Malik from Ayyub ibn Habib, the mawla ofSad ibn Abi Waqqas that Abu'l-Muthanna al-Juhani said, "I was withMarwan ibn al-Hakam and Abu Said al-Khudri came to him. Marwan ibn al-Hakam said to him, 'Have you heard that the Messenger of Allah, mayAllah bless him and grant him peace, forbade blowing into drinks?' AbuSaid said to him, 'Yes.' A man said to him, 'Messenger of Allah, I amnot quenched from one breath.' The Messenger of Allah, may Allah blesshim and grant him peace, said to him, 'Remove the cup from your mouthand then breathe.' He said, 'Sometimes I see something floating init?' He said, 'Then pour it out.'"
USC-MSA web (English) reference: Book 49, Hadith 12
Arabic reference: Book 49, Hadith 1685