Menstrual Periods
6/28. Chapter:
When a woman having bleeding in between her periods notices signs of cleanliness from her menses
قَالَ ابْنُ عَبَّاسٍ تَغْتَسِلُ وَتُصَلِّي وَلَوْ سَاعَةً، وَيَأْتِيهَا زَوْجُهَا إِذَا صَلَّتْ، الصَّلاَةُ أَعْظَمُ.Ibn ‘Abbas said: She should take a bath and offer Salat (prayers) even if (she were clean) for an hour and she can have (sexual relation with her husband) after the prayer, and As-Salat (the prayer) is more superior and important (than anything else).
Sahih Bukhari
حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، عَنْ زُهَيْرٍ، قَالَ حَدَّثَنَا هِشَامٌ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، قَالَتْ قَالَ النَّبِيُّ صلى الله عليه وسلم " إِذَا أَقْبَلَتِ الْحَيْضَةُ فَدَعِي الصَّلاَةَ، وَإِذَا أَدْبَرَتْ فَاغْسِلِي عَنْكِ الدَّمَ وَصَلِّي ".
Narrated `Aisha: The Prophet (ﷺ) said to me, "Give up the prayer when your menses begin and when it has finished, wash the blood off your body (take a bath) and start praying."
Reference : Sahih al-Bukhari 331In-book reference : Book 6, Hadith 35USC-MSA web (English) reference : Vol. 1, Book 6, Hadith 327