From Sahih Bukhari (Hadith 6629):
Narrated Jabir bin Samura:The Prophet (ﷺ) said, "If Caesar is ruined, there will be no Caesar after him; and if Khosrau is ruined, there will be no Khosrau, after him; and, by Him in Whose Hand my soul is, surely you will spend their treasures in Allah's Cause
Reference: Bukhari 6629