What did the Prophet Muhammad (saw) say about the potential ruin of Caesar and Khosrau ?
 Narrated Jabir bin Samura:                     The Prophet 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."