Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) would take three breaths (while drinking) from the vessel, saying Bismillah with each breath and saying Alhamdulillah at the last of them.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10437