Muwatta Malik #131
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، أَنَّهُ بَلَغَهُ أَنَّ عَائِشَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم قَالَتْ فِي الْمَرْأَةِ الْحَامِلِ تَرَى الدَّمَ أَنَّهَا تَدَعُ الصَّلاَةَ .
Yahya related to me from Malik that he had heard that A'isha, the
wife of the Prophet, may Allah bless him and grant him peace, said
that a pregnant woman who noticed bleeding left off from prayer.
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About Muwatta Malik
This hadith is #131 from Muwatta Malik, in the Book of Purity.