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Is the dust that comes off clothes that are impure (najis) when they are moved regarded as impure? Is whatever that dust gets onto also regarded as impure? I hope you can advise me.
Praise be to Allah.
A person is not affected by whatever gets onto him of dust from impure substances (najaasah) or clothes that have been contaminated with impure substances, for several reasons:
Shaykh al-Islam Ibn Taymiyah said: Things that are too difficult to avoid are overlooked, such as smoke and dust that have been transformed and originated from impure things, just as other things are overlooked that are too difficult to avoid, such as mud and dust from the streets."(Al-Fataawa al-Kubra 5/312).
Al-Khateeb ash-Sharbeeni said: A small amount of smoke coming from impure things and dust from animal dung, and the like, which may be carried by the wind as tiny particles, is overlooked."(Mughni al-Muhtaaj 1/128).
Al-Mirdaawi said: A small amount of smoke or dust or vapour from impure things may be overlooked, unless it shows one quality of the impure substance. This is the correct view according to our madhhab. Abu’l-Ma‘aali said that dust from impurities is overlooked in all cases, and he did not restrict it to small amounts, because there is no way to avoid it.
It says in al-Furoo‘: And this is the sound view."(Al-Insaaf 1/333).
And Allah knows best.