Sifrei Devarim 296

¹(Devarim 25:17) "Remember what Amalek did to you on the way when you went out of Egypt." "Remember": I might think (that remembrance) with the heart (is intended). But (19) "Do not forget" speaks of heart-forgetfulness. How, then, am I to understand "Remember"? (As referring to "remembrance") with the mouth. ²"on the way": at the time of your being tossed about. ³"when you went out of Egypt": at the time of your redemption. What is said (of that time)? (Shemoth 15:14) "Peoples heard and they trembled," but this one (Amalek) — (Devarim, Ibid . 18) "and he did not fear G-d." ⁴( Ibid .) "who met you upon the way": This connotes: He waylaid you. ⁵"and he cut off from you all who straggled behind you": We are hereby taught that he killed only those who dropped off from the ways of the L-rd and dropped from under the wings of the Shechinah. ⁶"and you were faint and weary": Israel; "and did not fear the L-rd": Amalek. ⁷( Ibid . 19) "And it shall be, when the L-rd your G-d gives you repose from all your enemies roundabout": so that they no longer band against you. ⁸"in the land that the L-rd your G-d gives to you as an inheritance": In reward for this mitzvah, you will inherit the land. ⁹"Wipe out the remembrance of Amalek from under the heavens": And thus is it written (Shemoth 17:14) "For I shall utterly blot out the remembrance of Amalek from under the heavens." That there be neither child nor grandchild (left of) Amalek under the heavens. And ( Ibid . 16) "For a hand (in oath) upon the throne of the L-rd — The L-rd will war against Amalek from generation to generation!" The L-rd had sworn upon His throne of glory: He will leave over neither child or grandchild of Amalek, neither camel not ass — so that they not say: "This is a camel of Amalek." "Do not forget"" in your heart.