Rashi on Numbers 14:12/רש"י על במדבר י״ד:י״ב

1ואורישנו is an expression for “driving out” (here, driving out from the world, destroying). — And if you ask what I will do regarding the oath I have sworn to the Patriarchs (viz., to give the Land to their children; cf. Exodus 6:3—4), then I reply:

2ואעשה אתך לגוי גדול I WILL MAKE OF THEE A GREAT NATION — [whereby My oath will be fulfilled] since you are one of their descendants (cf. Midrash Tanchuma, Sh'lach 13).