Abu Malik al-Ashja'i (may Allah have mercy on him) says: I asked my father about the qunut, and he said: I prayed behind the Prophet (peace and blessings be upon him), Sayyiduna Abu Bakr, Sayyiduna Umar and Sayyiduna Uthman (may Allah be pleased with them), and I did not see any of them ever recite the qunut.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3878