For the Amalekites and the Canaanites [are] there before you,
 &c.] Having removed from the valley, ( Numbers 14:25 ) ; or else had detached a party to defend the pass on the top of the mountain, and where perhaps they designed to feign a retreat if they found it proper, and draw them into a combat in the valley: 
 and ye shall fall by the sword:
 by the sword of the Amalekites and Canaanites: 
 because ye are turned away from the Lord:
 from the word of the Lord, from hearkening to and obeying his command: 
 therefore the Lord will not be with you;
 the consequence of which must be bad for them.