عَنْ أَنَسِ بْنِ مَالِكٍ أَنّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ كَانَ إِذَا شَرِبَ تَنَفَّسَ ثَلَاثًا وَقَالَ : هُوَ أَهْنَأُ وَأَمْرَأُ وَأَبْرَأُ (ابو داؤد شریف:۳۷۲۷/کتاب الاشربه)
Translation
Hazrat Anas bin Malik (may Allah be pleased with him) narrated that the Prophet (peace and blessings of Allah be upon him) used to drink water in three breaths. And he (peace and blessings of Allah be upon him) would say: "This breathing (drinking in breaths) quenches thirst properly, digests the food, and improves health." (Sunan Abu Dawud - Translated/Vol:3/Pg:143)