Sahih al-Bukhari 227
Narrated Asma':
A woman came to the Prophet (ﷺ) and said, "If anyone of us gets menses in her clothes then what should 
she do?" He replied, "She should (take hold of the soiled place), rub it and put it in the water and rub it 
in order to remove the traces of blood and then pour water over it. Then she can pray in it."
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا يَحْيَى، عَنْ هِشَامٍ، قَالَ حَدَّثَتْنِي فَاطِمَةُ، عَنْ أَسْمَاءَ، قَالَتْ جَاءَتِ امْرَأَةٌ النَّبِيَّ صلى الله عليه وسلم فَقَالَتْ أَرَأَيْتَ إِحْدَانَا تَحِيضُ فِي الثَّوْبِ كَيْفَ تَصْنَعُ قَالَ ‏
"‏ تَحُتُّهُ، ثُمَّ تَقْرُصُهُ بِالْمَاءِ، وَتَنْضَحُهُ وَتُصَلِّي فِيهِ ‏"‏‏.‏