1. Pure & purifying: human, horse, lawful-to-eat animal.
2. Impure: dog, pig, predatory land beast.
3. Pure but disliked when other water exists: cat, free-roaming chicken, predatory birds, mouse and similar cases; scorpion is excluded.
4. Pure but doubtful in purifying capacity: donkey and the relevant mule; if no other water exists, combine Wudu with Tayammum.
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Four Categories at a Glance
Leftover Water (Su'r): The Four Legal Categories
1. Pure & purifying: human, horse, lawful-to-eat animal.
2. Impure: dog, pig, predatory land beast.
3. Pure but disliked when other water exists: cat, free-roaming chicken, predatory birds, mouse and similar cases; scorpion is excluded.
4. Pure but doubtful in purifying capacity: donkey and the relevant mule; if no other water exists, combine Wudu with Tayammum.