Musnad Ahmad 25:1306

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Abu Bishr, from Sa'id ibn Jubayr, from Ibn Abbas, from the Prophet (peace and blessings of Allah be upon him): That he was asked about the children of the polytheists. He said: "Allah, when He created them, was most knowing of what they would have been doing."