It is narrated from Abu Mathna Johani, he says: I was sitting with Marwan bin Hakam when suddenly Abu Saeed Khudri (may Allah be pleased with him) came. Marwan said to him: Have you heard from the Messenger of Allah (peace be upon him) that he forbade blowing into water? Abu Saeed Khudri (may Allah be pleased with him) said: Yes! A man said: O Messenger of Allah (peace be upon him)! I am not satisfied with one breath. So he (peace be upon him) said: "Separate the cup from your mouth and then take a breath." Then that man said: What should I do if I see dirt in the water? The Messenger of Allah (peace be upon him) said: "Pour it out."