The Prophet ﷺ 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 ﷺ also said, "You will spend the treasures of both of them in Allah's Cause."
إِذَا هَلَكَ كِسْرَى فَلاَ كِسْرَى بَعْدَهُ وَذَكَرَ وَقَالَ لَتُنْفَقَنَّ كُنُوزُهُمَا فِي سَبِيلِ اللَّهِ