That the Prophet ﷺ prohibited blowing into the drink. A man said: "What about if one sees something floating in the vessel?" He said: "Spill it out (removing that)." He said: "I can not drink in one breath." He said: "Then remove the cup away from your mouth."  

أَنَّ النَّبِيَّ ﷺ نَهَى عَنِ النَّفْخِ فِي الشُّرْبِ فَقَالَ رَجُلٌ الْقَذَاةُ أَرَاهَا فِي الإِنَاءِ قَالَ أَهْرِقْهَا قَالَ فَإِنِّي لاَ أَرْوَى مِنْ نَفَسٍ وَاحِدٍ قَالَ فَأَبِنِ الْقَدَحَ إِذًا عَنْ فِيكَ  

"The Messenger of Allah ﷺ prohibited breathing in the vessel, or blowing into it."  

أَنَّ النَّبِيَّ ﷺ نَهَى أَنْ يُتَنَفَّسَ فِي الإِنَاءِ أَوْ يُنْفَخَ فِيهِ