It wasnarrated from Anas bin Malik that the Messenger of Allah (ﷺ)usedto recite Qunut in the Subh prayer, and he used to supplicate initagainst one of the Arab tribes for a month, then he stopped doingso. (PT)
English reference (PT): Vol. 1, Book 5, Hadith 1243 (PT)
Arabic reference (PT): Book 5, Hadith 1301 (PT)