Musnad Abu Ya'la al-Mawsili 153:157

Muhammad ibn Yahya al-Zamani narrated to us, Abu Dawud narrated to us, Shu'bah narrated to us, 'Asim ibn 'Ubayd Allah informed me, he said: I heard Ibn 'Abd Allah ibn 'Umar narrating from his father, that 'Umar ibn al-Khattab said: "O Messenger of Allah, have you considered what we do? Is it a matter that has already been finished, or is it a matter that is newly originated or initiated?" The Messenger of Allah (ﷺ) said: "Rather, it is what has already been finished." He said: "O Messenger of Allah, should we not then rely [upon it]?" He said: "Work, for everyone is facilitated [toward what he was created for]. Indeed, whoever is among the people of happiness will work for happiness, and whoever is among the people of misery will work for misery."