Al-Kāfi - Volume 3 > Women Find Hayd Blood after the Coming of the Time for a Salah (Prayer) Before Performing It Or Become Clean Before the Coming of the Time for a Salah (Prayer) But Are Too Lazy for Ghusl (bath)
Hadith #2

2ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحَجَّالِ عَنْ ثَعْلَبَةَ عَنْ مَعْمَرِ بْنِ يَحْيَى قَالَ سَأَلْتُ أَبَا جَعْفَرٍ (عَلَيْهِ الْسَّلام) عَنِ الْحَائِضِ تَطْهُرُ عِنْدَ الْعَصْرِ تُصَلِّي الأولَى قَالَ لاَ إِنَّمَا تُصَلِّي الصَّلاَةَ الَّتِي تَطْهُرُ عِنْدَهَا.

2. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Hajjal from Tha’labah from Mu’ammar ibn Yahya who has said the following: “I once asked abu Ja‘far, ‘Alayhi al-Salam, about the case of a woman experiencing Hayd (menses) becomes clean at the time of al-‘Asr must she perform al-Salah (prayer) before (al-‘Asr)? He (the Imam) said, ‘No, she is required to perform only al-Salah (prayer) in the time of which she has become clean.’”