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According to Ibn al-Qāsim’s position and the Egyptian transmitters’ reports from Mālik, an animal’s dying in standing water is treated differently from impurity entering it. This is because impurity dissolves in the water, whereas there is a risk that something may emerge from the animal when it dies that does not dissolve but remains on the surface. If the water has no flowing source, as in a basin or cistern, it must be discarded and not used for ablution, for fear that some of that impure matter may be present in the water used. If it is a well, enough water should be drawn out to put one’s mind at ease, unless the water has changed, in which case water must be drawn out until the change disappears.

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This ruling concerns animals with flowing blood. As for small creatures, such as those without flowing blood, and aquatic animals, such as crabs and frogs, their dying in water does not render it unfit for purification. If the small creatures break apart in the water, the ruling follows the disagreement over whether they may be eaten without ritual slaughter.