Musnad Ahmad 32:1940

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, and Hajjaj narrated to us, he said: Shu'bah narrated to me, he said: I heard Qatadah narrating from Anas ibn Malik, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said to Ubayy ibn Ka'b: Hajjaj said: "When {Those who disbelieved} [Al-Bayyinah: 1] was revealed," and both of them said: "Indeed, Allah has commanded me to recite {Those who disbelieved} [Al-Bayyinah: 1] to you." He said: "And has He named me?" He said: "Yes." He said: So he wept.