Musnad Ahmad 25:1508

'Abd al-Rahman narrated to us, Shu'bah narrated to us, from Abu Bishr, from Sa'id ibn Jubayr, from Ibn 'Abbas, who said: The Messenger of Allah, peace and blessings of Allah be upon him, was asked about the children of the polytheists. He said: "Allah created them when He created them, and He is most knowing of what they would have been doing."