Musnad Ahmad 1119:13

Haywah narrated to us, he said: Baqiyyah ibn al-Walid informed us, he said: Buhayr ibn Sa’d narrated to me, from Khalid ibn Ma’dan, from Jubayr ibn Nufayr, from ‘Awf ibn Malik, that he said: The Messenger of Allah (peace and blessings of Allah be upon him) stood among his companions and said: "Do you fear poverty, or want, or does the world concern you? For Allah will open for you the land of Persia and Rome, and the world will be poured upon you in abundance, until nothing will deviate you after me—if it deviates you—except it."