Riyad as-Saliheen 757
Anas (May Allah be pleased with him) reported:
Messenger of Allah ﷺ used to breathe three times in the course of a drink (he used to drink in three gulps).
[Al-Bukhari and Muslim].
عن أنس رضى الله عنه أن رسول الله ﷺ كان يتنفس في الشراب ثلاثاً.
Classification
Sahih (Authentic)
References
Riyad as-Saliheen 757
Riyad as-Saliheen Book of Etiquette of Eating, Hadith 30