Abd al-Rahman bin Ma'qil narrates that Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) performed qunut in the Maghrib prayer, in which he supplicated against certain people and their followers; he performed the qunut after bowing.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3324