20. Amalek . . . his latter end shall be that he perish for ever—Their territory was seen at the remote extremity of the desert. (See on Ex 17:13; also 1Sa 15:1-35).

     17-19. Remember what Amalek did—This cold-blooded and dastardly atrocity is not narrated in the previous history (Ex 17:14). It was an unprovoked outrage on the laws of nature and humanity, as well as a daring defiance of that God who had so signally shown His favor towards Israel (see on 1 Samuel 15; 27. 8; 30).