Musannaf Ibn Abi Shaybah

Ibn Awn says that I asked Qasim bin Muhammad, "Sometimes we come across ponds in which a dog has put its mouth or a donkey has drunk water. Can we drink from it or perform ablution with it?" Qasim looked at me and said, "When you go to a pond, do you wait and ask whether a dog has put its mouth in it or a donkey has drunk from it?"