وَمَا دُونَ رُبْعِ الثَّوْبِ أَوِ الْبَدَنِ مِنَ الْخَفِيفَةِ
The matn states that light impurity is excused when it is less than one quarter of the garment or body under consideration. Detailed quarter-calculation has more than one juristic explanation, so the beginner lesson keeps the matn wording rather than imposing a universal modern sleeve formula.
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Excused Amounts of Impurity and Transfer of Impurity
وَمَا دُونَ رُبْعِ الثَّوْبِ أَوِ الْبَدَنِ مِنَ الْخَفِيفَةِ
The matn states that light impurity is excused when it is less than one quarter of the garment or body under consideration. Detailed quarter-calculation has more than one juristic explanation, so the beginner lesson keeps the matn wording rather than imposing a universal modern sleeve formula.