Narrated Thumama bin `Abdullah: Anas used to breathe twice or thrice in the vessel (while drinking) and used to say that the Prophet; used to take three breaths while drinking.
Hadith Referenceصحيح البخاري / كتاب الأشربة / 5631
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة