Musnad Abu Ya'la al-Mawsili 248:4

Muhammad ibn Ubayd ibn Hisab narrated to us, Abu Awanah narrated to us, from Simak ibn Harb, from Jabir ibn Samurah, who said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) saying: "A group of the Muslims, or of the believers, shall surely conquer the treasure of the family of Kisra, which is in the White [Palace]." He said: And I heard him saying: "Indeed, Allah has named Medina 'Tabah'."