From Sahih Muslim (Hadith 7383):
Abdullah b. `Amr reported:I committed to memory a hadith from Allah's Messenger (ﷺ) and I did not forget it after I had heard Allah's Messenger (ﷺ) as saying: The first sign (out of the signs of the appearance of the Dajjal) would be the appearance of the sun from the west, the appearance of the beast before the people in the forenoon and which of the two happens first, the second one would follow immediately after that
Reference: Muslim 7383