وَلَا يَضُرُّ بَقَاءُ أَثَرٍ شَقَّ زَوَالُهُ
After the impurity itself has been removed, a remaining color or smell that is genuinely difficult to eliminate does not prevent legal purity. Soap is not a separate legal requirement; the point is that a genuinely difficult residual trace is excused.
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How Physical Impurity Is Purified
وَلَا يَضُرُّ بَقَاءُ أَثَرٍ شَقَّ زَوَالُهُ
After the impurity itself has been removed, a remaining color or smell that is genuinely difficult to eliminate does not prevent legal purity. Soap is not a separate legal requirement; the point is that a genuinely difficult residual trace is excused.