The Amalekite and the Canaanite are before you, by whose sword you shall be ruined, for you were not willing to consent to the Lord, and so the Lord is not with you.
Other versions
King James Version
For the Amalekites and the Canaanites are there before you, and ye shall fall by the sword: because ye are turned away from the LORD, therefore the LORD will not be with you.English Standard Version
For there the Amalekites and the Canaanites are facing you, and you shall fall by the sword. Because you have turned back from following the LORD, the LORD will not be with you."New International Version
for the Amalekites and Canaanites will face you there. Because you have turned away from the LORD, he will not be with you and you will fall by the sword."