Virtues and Merits of the Prophet (pbuh) and his Companions
حَدَّثَنَا قَبِيصَةُ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ جَابِرِ بْنِ سَمُرَةَ، رَفَعَهُ قَالَ " إِذَا هَلَكَ كِسْرَى فَلاَ كِسْرَى بَعْدَهُ ـ وَذَكَرَ وَقَالَ ـ لَتُنْفَقَنَّ كُنُوزُهُمَا فِي سَبِيلِ اللَّهِ ".Narrated Jabir bin Samura:The Prophet (ﷺ) said, "When Khosrau perishes, there will be no more Khosrau 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
From Sahih al-Bukhari, whose reports the scholars accept as authentic.