Hadith #7209 (Sahih Muslim)
Book: The Book of Tribulations and Portents of the Last Hour
Narrator(s): Umm Shareek
Grade: Sahih

I heard Allah’s Messenger (ﷺ) as saying: The people would run away from the Dajjal seeking shelter in the mountains. She said: Where would be the Arabs then in that day? He said: They would be small in number.

Source: https://parallelquran.com/hadith/sahih-muslim-7209/