Musnad Abu Ya'la al-Mawsili 176:1

Ubayd Allah ibn Umar al-Qawariri narrated to us, Abd al-A’la ibn Abd al-A’la narrated to us, Sa’id ibn Iyas al-Jurayri narrated to us, from Abu al-Ala, from Abd al-Rahman ibn Sahar—and he was from Abd al-Qays—from his father, who said: The Messenger of Allah (ﷺ) said: "The Hour will not be established until there is a swallowing up (khasf) of tribes from the Banu so-and-so." I knew that the Banu so-and-so were from the Arabs, and that the non-Arabs (Ajam) were attributed to their villages.