On it being disliked to blow on drinks

Riyad as-Salihin (The Meadows of the Righteous)

by Imam Nawawi

113. Chapter: On it being disliked to blow on drinks

765. Abu Sa'id al-Khudri reported that the Prophet, may Allah bless him and grant him peace, forbade blowing into drink. A man said, "What if I see some impurity in the vessel?" He said, "Pour it out." He said, "My thirst is not quenched in one breath." He said, "Then take the vessel away from your mouth." [at-Tirmidhi]

766. Ibn 'Abbas reported that the Prophet, may Allah bless him and grant him peace, forbade breathing into a vessel or blowing into it." [at-Tirmidhi]