The Messenger of Allah ﷺ forbade blowing into food and drink.
حدثنا عبد الرحمن بن مهدي عن إسرائيل عن عبد الكريم عن عكرمة
نهى رسول الله ﷺ عن النفخ في الطعام والشراب
Its isnad is sahih. Tirmidhi related it, 3:113, via Sufyan, from Abdul-Kareem Jazari, and said, "A hasan sahih hadith." Abu Dawud related something similar, 3:392, via Ibn Uyayna, from Abdul-Kareem, and it will come again at 3366.