Muwatta Malik #126
Purity
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، أَنَّ عَائِشَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم كَانَتْ مُضْطَجِعَةً مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فِي ثَوْبٍ وَاحِدٍ وَأَنَّهَا قَدْ وَثَبَتْ وَثْبَةً شَدِيدَةً فَقَالَ لَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم " مَا لَكِ لَعَلَّكِ نَفِسْتِ " . يَعْنِي الْحَيْضَةَ . فَقَالَتْ نَعَمْ . قَالَ " شُدِّي عَلَى نَفْسِكِ إِزَارَكِ ثُمَّ عُودِي إِلَى مَضْجَعِكِ " .
Yahya related to me from Malik from Rabia ibn Abi Abd ar-Rahman
that on one occasion A'isha, the wife of the Prophet, may Allah bless
him and grant him peace, was sleeping with the Messenger of Allah, may
Allah bless him and grant him peace, in one garment, when suddenly she
jumped up sharply. The Messenger of Allah, may Allah bless him and
grant him peace, said to her, "What's the matter with you? Are you
losing blood?", meaning menstruating. She said, "Yes." He said, "Wrap
your waist-wrapper tightly about you, and return to your sleeping-
place."
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About Muwatta Malik
This hadith is #126 from Muwatta Malik, in the Book of Purity.