Hadees ~ Rain water, snow, and hail:

These substances are pure because Allah says so: "And sent down water
from the sky upon you, that thereby He might purify you..." (al-Anfal
1), and"We send down purifying water from the sky" (al-Furqan 48).
This is also supported by the following hadith: Abu Hurairah reported
that the Messenger of Allah, upon whom be peace, used to be silent
between the (opening) takbir of the prayer and the verbal Qur'anic
recitation. Abu Hurairah asked him, "O Messenger of Allah, may my
father and mother be sacrificed for you, why do you remain silent
between the takbirand the recital? What do you say(silently during
that time)?" He said, "I say, 'O Allah, make a distance between me and
my sins similar to the distance you have made between the East and the
West. O Allah, cleanse me of my sins in the manner that a white
garment (is cleansed) from dirt. O Allah, wash my sins from me with
snow, water, and hail."' This hadith is related by the "group", except
for at-Tirmizhi.

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