Or HaChaim on Deuteronomy 10:15/אור החיים על דברים י׳:ט״ו

1 כיום הזה, as of this day. Moses means that the Jewish people are a worthy community as he had already testified in Deut. 4,4 that "you all cleaved to G'd and stayed alive." The message is that were it not for that merit, the mere fact that they were the descendants of the patriarchs whom G'd had liked would not have helped them if they had been wicked. The best proof for the truth of this statement is the fact that Ishmael, also a son of Abraham, or Esau, a son of Isaac and a grandson of Abraham were not chosen and only some of the descendants of Isaac developed into the Jewish people. (compare Nedarim 31).