Mishkat al-Masabih #2008
Fasting
Anas said that the Prophet was accustomed to engage in private devotion in the mosque during the last ten nights of Ramadan; but one year he omitted it and he engaged in it during twenty nights the next year.
Tirmidhi transmitted it, and Abu Dawud and Ibn Majah transmitted it from Ubayy b. Ka'b.
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About Mishkat al-Masabih
This hadith is #2008 from Mishkat al-Masabih, in the Book of Fasting. Mishkat al-Masabih contains 4,428 hadiths across 25 books.