(a) It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) recited the qunut for one month, in which he kept supplicating against Usayyah and Dhakwan. Then when he prevailed over them, he abandoned the qunut.
(b) Abd al-Rahman bin Mahdi (may Allah have mercy on him) said that he (peace and blessings be upon him) only abandoned the supplicating against them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3155