Rashi on Numbers 14:40/רש"י על במדבר י״ד:מ׳

1אל ראש ההר [AND THEY … WENT UP] INTO THE TOP OF THE MOUNTAIN — that is the route that leads up to the Land of Israel.

2הננו ועלינו אל המקום LO, WE ARE HERE, AND WILL GO UP INTO THE PLACE, viz., to the Land of Israel,

3אשר אמר ה׳ WHICH THE LORD HATH PROMISED to give us; thither will we go up, (and we will not return to Egypt).

4כי חטאנו FOR WE HAVE SINNED in that we said, (v. 3) “were it not better for us to return to Egypt?”