Musnad Ahmad 32:1691

'Affan narrated to us, 'Abd al-Warith narrated to us, Abu 'Isam narrated to us, from Anas ibn Malik, who said: The Messenger of Allah (may Allah bless him and grant him peace) used to breathe three times while drinking, and he would say: "It is more quenching, more wholesome, and more healthful." Anas said: "And I breathe three times while drinking."