Ubaydullah bin 'Abdullah bin 'Utba عبيد الله بن عبد الله بن عتبة بن مسعود · Drinks (Kitab Al-Ashribah)

The apostle of allah (ﷺ) forbade drinking from the mouth of a water-skin, and riding the animal which feeds on filth and eating the animal which is killed in confinement. Abu Dawud said: Jallalah means an animal which eats filth and impurities.

Invert the head of the vessel and he drank from its mouth.