أَخْبَرَنَا يَزِيدُ بْنُ هَارُونَ، عَنْ هِشَامٍ الدَّسْتَوَائِيِّ، عَنْ حَمَّادٍ، عَنْ إِبْرَاهِيمَ، فِيمَا تَلْبَسُ الْمَرْأَةُ مِنْ الثِّيَابِ وَهِيَ حَائِضٌ "إِنْ أَصَابَهُ دَمٌ، غَسَلَتْهُ، وَإِلَّا فَلَيْسَ عَلَيْهَا غَسْلُهُ وَإِنْ عَرِقَتْ فِيهِ، فَإِنَّهُ يُجْزِئُهَا أَنْ تَنْضَحَهُ".
It is narrated from Imam Ibrahim Nakha'i, may Allah have mercy on him: The cloth which a menstruating woman wears, if blood gets on it, then she should wash it. If blood has not gotten on it, then washing is not necessary, even if there is sweat on it; merely sprinkling water on it is sufficient.