Rashi on Numbers 14:25/רש"י על במדבר י״ד:כ״ה

1והעמלקי וגו׳ AND THE AMALEKITES [AND THE CANAANITES DWELL IN THE VALLEY] — This is not a mere statement that they dwell there; it is a warning: If you go there they will kill you, since I shall not be with you.

2מחר פנו TOMORROW TURN YOU — i.e. turn backwards, וסעו לכם AND JOURNEY [INTO THE DESERT etc.].