"There are four things which the Prophet never gave up: Fasting 'Ashura', (fasting during) the ten days, (fasting) three days of each month, and praying two Rak'ahs before Al-Ghadah (Fajr)."
Reference: Sunan an-Nasa'i 2416 In-book : Book 22, Hadith 327 English translation : Vol. 3, Book 22, Hadith 2418
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