It was narrated from Nafi" bin "Utbah bin Abi Waqqas that he heard the Prophet (ﷺ) say:

“You will fight in Arabia and Allah will grant you victory over it, then you will fight Persia and Allah will grant you victory over it, then you will fight Byzantium and Allah will grant you victory over it. Then you will fight the Dajjal and Allah will grant you victory over him."