Musnad Ahmad 30:3524

Aswad narrated to us, Abu Bakr narrated to us, from Dawud, from his father, from Abu Hurairah, who said: Sa’d approached the Prophet, peace and blessings of Allah be upon him. When he saw him, the Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, there is news in the face of Sa’d." He said: "Chosroes has been killed." He said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "May Allah curse Chosroes. The first of the people to perish are the Arabs, then the people of Persia."