Musnad Ahmad 1:70

Waki’ narrated to us, Ibn Abi Khalid narrated to us, from Abu Bakr ibn Abi Zuhayr al-Thaqafi, who said: When the verse was revealed: "It is not by your wishes, nor the wishes of the People of the Scripture; whoever does evil will be recompensed for it," Abu Bakr said: "O Messenger of Allah, are we to be recompensed for every evil we do?" The Messenger of Allah, peace and blessings of Allah be upon him, said: "May Allah have mercy on you, O Abu Bakr. Do you not become weary? Do you not grieve? Does hardship not afflict you? For this is what you are recompensed for."