Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 816
Narrated Jabir bin Samura:
The Prophet said, "When Khosrau perishes, there will be no more Khosrau a after him, and when Caesar perishes, there will be no more Caesar after him," The Prophet also said, "You will spend the treasures of both of them in Allah's Cause."