From Sahih Bukhari (Hadith 4635):
Narrated Abu Huraira:Allah's Messenger (ﷺ) said, "The Hour will not be established until the sun rises from the West: and when the people see it, then whoever will be living on the surface of the earth will have faith, and that is (the time) when no good will it do to a soul to believe then, if it believed not before
Reference: Bukhari 4635