Allah's Messenger (ﷺ) said, "When Khosrau perishes, there will be no (more) Khosrau after him, and when Caesar perishes, there will be no more Caesar after him. By Him in Whose Hands Muhammad's life is, you will spend the treasures of both of them in Allah's Cause."
Reference: Sahih al-Bukhari 3618 In-book : Book 61, Hadith 125 USC-MSA web (English) : Vol. 4, Book 56, Hadith 815 (deprecated)
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