Musnad Abu Ya'la al-Mawsili 1:97

99. Al-Qawariri narrated to us, Yahya bin Sa’id and Waki’ narrated to us, from Isma’il bin Abi Khalid, from Abu Bakr bin Abi Zuhayr, that Abu Bakr al-Siddiq said: I said, "O Messenger of Allah, how is righteousness [possible] after this verse: 'Whoever does evil will be recompensed for it' [Surah An-Nisa, verse 123]?" He said, "May Allah have mercy on you, Abu Bakr. Do you not become weary? Do you not suffer hardship? That is what you are recompensed for."