The Messenger of Allah (ﷺ) observed Qunut for a month in the dawn prayer after ruku' and invoked curse upon Ri'l, Dhakwan, and said that 'Usayya had disobeyed Allah and His Apostle (ﷺ).
Reference: Sahih Muslim 677 c In-book : Book 5, Hadith 383 USC-MSA web (English) : Book 4, Hadith 1435 (deprecated)
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