It is also reported: “None of you should urinate in still water that does not flow, then bathe in it.” (Bukhari: “…then bathe from it.”) (1) (Muslim and others: “…then perform ablution from it.”) (T)
That water remains purifying; nothing renders it impure unless its properties are altered by the impurity itself. This view was adopted by Ibn Taymiyyah (3) in Majmūʿat al-Rasāʾil (2/217).
2 – Leftover water of animals
If a dog has lapped from it, pour the water away. As for the cat, it is not impure.
3 – Cleansing impurities
Impurities include human feces and urine, the dung of horses, mules, and donkeys, blood, and pre-seminal fluid (madhy).
The usual means of purification is washing with water. Regarding menstrual blood and similar substances, Asmāʾ bint Abī Bakr narrated: “A woman came to the Prophet ﷺ and said, ‘One of us may get menstrual blood on her garment; what should she do?’ He replied, ‘Scrape it, then rub it with water, then sprinkle it, and then pray in it.’” (agreed upon)
Contaminated ground is purified by saturating it with abundant water, as in the ḥadīth of the Bedouin, and by exposure to sun and wind once no trace of impurity remains; this was the preference of the Shaykh (11).
A vessel from which a dog has drunk is cleansed by washing it seven times with water and scouring it once with earth.
Whatever is stained with madhy or with the urine of a nursing baby boy is purified by sprinkling; this first method was the Shaykh’s choice (15), unlike the urine of a baby girl.
A shoe is purified by wiping it against the ground, and hides as well.