هذا يعني به إذا أصابه قذر مع العرق ألا ترى انه قال: فإذا عرقت ما دون الازار لا تغسله فنبه انه إذا عرقت في موضع الازار فالغالب من احوالهن ان تكون هناك نجاسة فلاجل هذا قال: تغسله، والذي يكشف عن هذا الوجه.
This implies that if the sweat is accompanied by impurity, it must be washed. Notice that he specified the area beneath the garment, indicating that the usual condition for women in that state might include impurity in that region. This is why he instructed to wash it. The explanation clarifies that the need for washing depends on the likelihood of impurity being present with the sweat, particularly in areas most prone to such impurity.
