Al-Kāfi - Volume 3 > Washing Clothes of Women during Hayd
Hadith #2

2ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ عُقْبَةَ بْنِ مُحْرِزٍ عَنْ إِسْحَاقَ بْنِ عَمَّارٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ الْحَائِضُ تُصَلِّي فِي ثَوْبِهَا مَا لَمْ يُصِبْهُ دَمٌ.

2. Ali ibn Ibrahim has narrated from his father from ibn abu ‘Umayr from ‘Uqbah ibn Muhriz from Ishaq ibn ‘Ammar who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘Women experiencing Hayd (menses) can perform Salah (prayer) in their clothes if they have not come in contact with blood.’”