Musnad Abu Ya'la al-Mawsili 2:62

Ibrahim ibn al-Hajjaj al-Sami narrated to us, Hammad narrated to us, from Abdullah ibn al-Mukhtar, from Abd al-Malik ibn Umayr, from Abdullah ibn al-Zubayr, from Umar ibn al-Khattab, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever is distressed by his evil deed and gladdened by his good deed, then he is the believer."