Abu Murra, the freed slave of Umm Hani, narrated on the authority of Abu Darda':
My Friend (ﷺ) instructed me in three (acts), and I would never abandon them as long as I live. (And these three things are): Three fasts during every month, the forenoon prayer, and this that I should not sleep till I have observed the Witr prayer.
Reference: Sahih Muslim 722 In-book : Book 6, Hadith 105 USC-MSA web (English) : Book 4, Hadith 1561 (deprecated)
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