Musnad Ahmad 30:560

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri, from Ibn al-Musayyib, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Chosroes will depart, and there will be no Chosroes after him; and Caesar will depart, and there will be no Caesar after him. By the One in Whose hand is my soul, you will surely spend their treasures in the way of Allah."