Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) says: "The Messenger of Allah (peace and blessings be upon him) recited the qunut for only thirty nights, invoking against the tribes of Banu Sulaym, Ri'l, Dhakwan and Usayyah, because they had disobeyed Allah and His Messenger."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9958