question #3 Sahih al-Bukhari 6629, Book 83, Hadith 9 : What does the hadith imply about the fate of powerful rulers and their empires in the context of Islamic history?

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.”