Does a small amount of water become najis (impure) if some impurity falls into it but its characteristics do not change?

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If some pork falls into water and none of its characteristics are changed
Remedy for Whispers from Shaytan

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Mother’s milk is taahir (pure) according to scholarly consensus
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If some pork falls into water and none of its characteristics are changed
Remedy for Whispers from Shaytan

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