Musannaf Ibn Abi Shayba 3:3039

Al-Fadl ibn Dukayn narrated to us, from Sharik, from Abu Ishaq, who said: I prayed Jumu'ah behind al-Mughirah ibn Shu'bah and al-Nu'man ibn Bashir, and they did not perform Qunut. And I prayed behind Ali, so I said: "Shall I perform Qunut with you?" He said: "No."