Mishkat al-Masabih #1940
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ مُعَاذَةَ الْعَدَوِيَّةِ أَنَّهَا قَالَتْ لِعَائِشَةَ: مَا بَالُ الْحَائِضِ تَقْضِي الصَّوْمَ وَلَا تَقْضِي الصَّلَاةَ؟ قَالَتْ عَائِشَةُ: كَانَ يُصِيبُنَا ذَلِكَ فَنُؤْمَرُ بِقَضَاءِ الصَّوْمِ وَلَا نُؤْمَرُ بِقَضَاءِ الصَّلَاةِ. رَوَاهُ مُسْلِمٌ
Mu'adha al-‘Adawiya said that when she asked ‘A'isha why one who has been menstruating must make up for her fast but not for her prayer, she replied, “That happened to us, and we were ordered to make up for the fast, but were not ordered to make up for the prayer.”
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #1940 from Mishkat al-Masabih, in the Book of Fasting.