Messenger of Allah ﷺ said, "When Khosrau is ruined, there will be no Khosrau after him; and when Caesar is ruined, there will be no Caesar after him. By Him in Whose Hands my life is, you will spend their treasures in Allah's Cause." (Using translation from Bukhārī 3120)
عَنِ النَّبِيِّ ﷺ قَالَ إِذَا هَلَكَ قَيْصَرُ فَلَا قَيْصَرَ بَعْدَهُ وَإِذَا هَلَكَ كِسْرَى فَلَا كِسْرَى بَعْدَهُ وَالَّذِي نَفْسِي بِيَدِهِ لَتُنْفَقَنَّ كُنُوزُهُمَا فِي سَبِيلِ اللهِ