…The Dajjal (the Antichrist) would appear in my Ummah and he would stay (in the world) for forty - I cannot say whether he meant forty days, forty months or forty years. And Allah would then send Jesus son of Mary who would resemble 'Urwa b Mas’ud. He (Jesus Christ) would chase him and kill him.

https://sunnah.com/muslim:2940a