Musnad Abu Ya'la al-Mawsili 246:15

Zuhayr narrated to us, Abd al-Rahman ibn Mahdi narrated to us, Shu'bah narrated to us, from al-Nu'man ibn Salim, who said: I heard a man who heard Jubayr say: I said, "O Messenger of Allah, indeed some people say that we have no rewards in Makkah." He said, "Your rewards will surely come to you, even if you were in the hole of a fox."