The Prophet ﷺ said, "Khosrau will be ruined, and there will be no Khosrau after him, and Caesar will surely be ruined and there will be no Caesar after him, and you will spend their treasures in Allah's Cause." He called, "War is deceit'.
عَنِ النَّبِيِّ ﷺ قَالَ هَلَكَ كِسْرَى ثُمَّ لاَ يَكُونُ كِسْرَى بَعْدَهُ وَقَيْصَرٌ لَيَهْلِكَنَّ ثُمَّ لاَ يَكُونُ قَيْصَرٌ بَعْدَهُ وَلَتُقْسَمَنَّ كُنُوزُهَا فِي سَبِيلِ اللَّهِ وَسَمَّى الْحَرْبَ خَدْعَةً
This is what Abu Huraira reported from Messenger of Allah ﷺ and in this connection he reported so many hadith (and one of them was this): Messenger of Allah ﷺ said: Kisra would die and then there would be no Kisra after him. Qaisar would die and there would be no Qaisar after him, but you will distribute their treasures in the cause of Allah.
عَنْ رَسُولِ اللَّهِ ﷺ فَذَكَرَ أَحَادِيثَ مِنْهَا وَقَالَ رَسُولُ اللَّهِ ﷺ هَلَكَ كِسْرَى ثُمَّ لاَ يَكُونُ كِسْرَى بَعْدَهُ وَقَيْصَرُ لَيَهْلِكَنَّ ثُمَّ لاَ يَكُونُ قَيْصَرُ بَعْدَهُ وَلَتُقْسَمَنَّ كُنُوزُهُمَا فِي سَبِيلِ اللَّهِ
This is what Abu Huraira reported from Messenger of Allah ﷺ and in this connection he reported so many hadith (and one of them was this): Messenger of Allah ﷺ said: Kisra would die and then there would be no Kisra after him. Qaisar would die and there would be no Qaisar after him, but you will distribute their treasures in the cause of Allah. (Using translation from Muslim 2918b)
وَقَالَ رَسُولُ اللهِ ﷺ هَلَكَ كِسْرَى ثُمَّ لَا يَكُونُ كِسْرَى بَعْدَهُ وَقَيْصَرُ لَيَهْلِكَنَّ ثُمَّ لَا يَكُونُ قَيْصَرُ بَعْدَهُ وَلَتُقَسِّمُنَّ كُنُوزَهُمَا فِي سَبِيلِ اللهِ ﷻ
"هَلَكَ كسْرَى، ثُمَّ لَا كسْرَى بَعْدَهُ، وَقَيصَرُ لَيَهْلِكَنَّ ثُمَّ لا يَكُونُ قَيصَرُ بَعْدَهُ، وَلَتُقَسَّمَنَّ كُنُوزُهُمَا في سَبِيلِ اللهِ".
"مزَّقَ كسْرى كِتَابِى، ليُمَزَّقَنَّ مُلكُهُ، فَلَيَهْلكَنَّ كِسْرى، ثمَّ لا يكُونُ كِسْرى بَعْدهُ. ولَيهْلِكنَّ قَيصرُ [ثُمَّ لا يكونُ قَيصرُ] (*) ولَيُنفقنَّ كُنُوزهُما فِي سَبيلِ الله".