What is the ruling regarding water from which a cat drank after eating impurity and disappearing?

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The water is pure if a cat ate an impurity and then drank from a small amount of water after it disappeared (i.e., the cat left). This ruling is established because the Prophet, peace be upon him, negated impurity regarding the cat's saliva and performed ablution with the remainder of the water it drank, despite knowing the cat consumes impurities. The basis is the established concession concerning the cat.