The Messenger of Allah ﷺ performed the qunut for an entire month in the Dhuhr, Asr, Maghrib, Isha, and Fajr prayers. After every prayer, when he said, "Allah hears the one who praises Him," in the final rakah, he would supplicate against them, against the tribes of Banu Sulaym, namely Ril, Zakwan, and Usayyah, and those behind him would say "Amin." He had sent messengers to them inviting them to Islam, but they killed them.
قنت رسول الله ﷺ شهرا متتابعا في الظهر والعصر والمغرب والعشاء والصبح في دبر كل صلاة إذا قال: سمع الله لمن حمده. من الركعة الأخيرة، يدعو عليهم على حيى من بني سليم على رعل وذكوان وعصية. ويؤمن من خلفه، أرسل إليهم يدعوهم إلى الإسلام فقتلوهم.
Abu Dawud (1443) and Ahmad (2746) narrated it, and Ibn Khuzayma (618) and Hakim (1/225-226) both graded it sahih, all of them by way of Thabit bin Yazid al-Ahwal, who said, Hilal narrated to us, from Ikrima, from Ibn Abbas, who mentioned it.Hakim said, "It meets the criteria of Bukhari."I say, its isnad is hasan because of Hilal, who is Ibn Khabab. There is disagreement about him, but he is hasan in his hadith, and he is not among the narrators of Bukhari.