Hadith 15:440
Abu Bakr narrated to us, he said: Abu al-Ahwas narrated to us, from Simak, he said: I was in a gathering of the Ansar, and one of them brought a drink. When he wanted to drink, he blew into it. Some of the people said: "Wait, for the Messenger of Allah (peace and blessings of Allah be upon him) used to forbid that."
حدثنا أبو بكر قال حدثنا أبو الأحوص عن سماك قال كنت في مجلس الأنصار فأتى بعضهم بشراب فلما أراد أن يشرب نفخ فيه فقال بعض القوم مهلا فإن رسول الله صلى الله عليه وسلم كان ينهى عنه