Musnad Ahmad 27:1434

Ishaq, meaning Ibn al-Taba', narrated to us, Malik informed me, from Ziyad ibn Sa'd, from 'Amr ibn Muslim, from Tawus al-Yamani, who said: I reached a group of the companions of the Prophet, may Allah bless him and grant him peace, saying: "Everything is by decree." He said: And I heard Abdullah ibn Umar saying: The Messenger of Allah, may Allah bless him and grant him peace, said: "Everything is by decree, even incapacity and intelligence."