Sforno on Numbers 23:9/ספורנו על במדבר כ״ג:ט׳

1הן עם לבדד ישכון, in the final analysis, they are the only people who will eventually populate the earth. This concept is repeated by Moses in Deuteronomy 32,12 ה' בדד ינחנו, “the Lord will guide only them alone.” It will be impossible to destroy them.