Musnad Ahmad 920:14

Narrated to us Abdullah, narrated to us Surayj ibn Yunus and Abu al-Rabi' al-Zahrani, they said: Narrated to us Salam ibn Qutaybah, narrated to us Abd al-Jabbar ibn Abbas al-Hamdani, from Abu Ishaq, from Sa'id ibn Jubayr, from Ibn Abbas, from Ubayy ibn Ka'b, from the Prophet, peace and blessings of Allah be upon him: "The boy whom the companion of Musa killed was created, on the day he was created, as a disbeliever."