The Five Books of Moses, by Everett Fox
Hearkening back to Ex. 17:8–16, this passage clarifies the crime of the Amalekites against the newly freed Israelites. The attack on the rear was remembered bitterly in the Bible; cf. I Sam. 15 and the book of Esther, where the villain, Haman, is portrayed as a descendant of the Amalekite king Agag.