Musnad Ahmad 30:2566

Muhammad ibn Ubayd and Yazid narrated to us, they said: Muhammad ibn Amr informed us, from Abu Salamah, from Abu Hurayrah, who said: They said: "O Messenger of Allah, we find within ourselves that which it would not please us to speak of, nor would we want to have what the sun rises upon [in exchange for it]." He said: "Have you found that?" They said: "Yes." He said: "That is the clear faith."