" كان إذا شرب تنفس ثلاثا ويقول: هو أهنأ وأمرأ, وأبرأ"
It was the practice of the Prophet (peace and blessings be upon him):
"When he (peace and blessings be upon him) drank something, he would breathe three times and say: This is more pleasant, more wholesome and more healthful."
Hadith Referenceصحیح الجامع الصغیر / حرف الكاف / 4744