Mishkat al-Masabih #1969
Fasting
Muslim al-Qurashi said that he or someone else asked God's messenger about perpetual fasting, and he replied, “You have a duty to your family. Fast during Ramadan and the following month, and every Wednesday and Thursday. You will then have observed a perpetual fast."
Abu Dawud and Tirmidhi transmitted it.
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About Mishkat al-Masabih
This hadith is #1969 from Mishkat al-Masabih, in the Book of Fasting. Mishkat al-Masabih contains 4,428 hadiths across 25 books.