Sahih Muslim 267
Sahih Muslim · Book 36: The Book of Drinks · It is disliked to breathe into the vessel, and it is recommended to take three breaths, outside the vessel
حَدَّثَنَا ابْنُ أَبِي عُمَرَ ، حَدَّثَنَا الثَّقَفِيُّ ، عَنْ أَيُّوبَ ، عَنْ يَحْيَى بْنِ أَبِي كَثِيرٍ ، عَنْ عَبْدِ، اللَّهِ بْنِ أَبِي قَتَادَةَ عَنْ أَبِيهِ ، أَنَّ النَّبِيَّ صلى الله عليه وسلم نَهَى أَنْ يُتَنَفَّسَ فِي الإِنَاءِ .
Abu Qatada reported on the authority of his father that Allah's Apostle (ﷺ) forbade breathing in a vessel.