Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "When Chosroes perishes, there will be no Chosroes after him; and when Caesar perishes, there will be no Caesar after him. By the One in whose hand is my soul, the treasures of both of them will surely be spent in the path of Allah."
Imam al-Tabarani recorded it in al-Mu'jam al-Saghir and al-Mu'jam al-Awsat from his teacher Ubayd bin Kathir al-Tammar, and he is matruk (abandoned).