Albert Barnes Commentary Numbers 14:25

"Now the Amalekite and the Canaanite dwell in the valley: to-morrow turn ye, and get you into the wilderness by the way to the Red Sea." — Numbers 14:25 (ASV)

The verse can be rendered: And now the Amalekites and the Canaanites are dwelling (or abiding) in the valley: therefore turn, etc. (so that you are not struck down before them). The Amalekites were the nomad bands that roved through the open pastures of the plain (Numbers 14:45). The Canaanites, a term used here in its wider sense, were the Amorites of the neighboring cities (compare Numbers 14:45 with Deuteronomy 1:44), who probably lived in league with the Amalekites.

Tomorrow – Not necessarily the next day, but an idiom for “hereafter” or “henceforward” (compare the marginal reading in Exodus 13:14 and Joshua 4:6).

By the way of the Red Sea – That is, apparently, by the eastern or Elanitic gulf.