Muwatta Malik #129
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَلْقَمَةَ بْنِ أَبِي عَلْقَمَةَ، عَنْ أُمِّهِ، مَوْلاَةِ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ أَنَّهَا قَالَتْ كَانَ النِّسَاءُ يَبْعَثْنَ إِلَى عَائِشَةَ أُمِّ الْمُؤْمِنِينَ بِالدِّرَجَةِ فِيهَا الْكُرْسُفُ فِيهِ الصُّفْرَةُ مِنْ دَمِ الْحَيْضَةِ يَسْأَلْنَهَا عَنِ الصَّلاَةِ فَتَقُولُ لَهُنَّ لاَ تَعْجَلْنَ حَتَّى تَرَيْنَ الْقَصَّةَ الْبَيْضَاءَ . تُرِيدُ بِذَلِكَ الطُّهْرَ مِنَ الْحَيْضَةِ .
Yahya related to me from Malik from AIqama ibn Abi AIqama that
his mother, the mawla of A'isha, umm al-muminin, said, "Women used to
send little boxes to A'isha, umm al-muminin, with a piece of cotton
cloth in each one on which was yellowness from menstrual blood, asking
her about the prayer. She said to them, 'Do not be hasty until you see
a white discharge." By that she meant purity from menses.
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About Muwatta Malik
This hadith is #129 from Muwatta Malik, in the Book of Purity.