(111) Chapter: Etiquette of Drinking Water

Abu Qatadah (May Allah be pleased with him) reported: The Prophet (ﷺ) forbade breathing into the vessel while drinking.

[Al-Bukhari and Muslim].

Commentary: The Messenger of Allah (PBUH) prohibited us from breathing in the drinking vessel because the bad smell or spittle may flow into the drink. This is both loathsome as well as injurious to one's health.