Bulugh al-Maram #783
Fasting
And it's basic meaning is in Al-Bukhari and Muslim from the narration of Aisha (with the wording) "that Hamza bin 'Amro asked".
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About Bulugh al-Maram
This hadith is #783 from Bulugh al-Maram, in the Book of Fasting. Bulugh al-Maram contains 1,767 hadiths across 16 books.