The Targum Pseudo-Jonathan closes the Amalek story with one of the most extraordinary vows in the Torah. "Because the Word of the Lord hath sworn by the throne of His glory, that He by His Word will fight against those of the house of Amalek, and destroy them unto three generations; from the generation of this world, from the generation of the Meshiha, and from the generation of the world to come" (Exodus 17:16).
The oath is sworn "by the throne of His glory" — the highest possible guarantee in heaven. And it operates in three epochs. First, this world — the ordinary age of history where Amalek's descendants will be struck down by Saul, by Mordecai and Esther over Haman the Agagite, by every generation that defends Israel. Second, the generation of the Meshiha, the Messianic age, when the final traces of Amalek will be uprooted. Third, the world to come, olam ha-ba, where no shadow of Amalek will remain.
The Aramaic theology here is stunning. Amalek is not just a tribe. Amalek is a persistent pattern — cruelty toward the weak, contempt for the covenant, the cold raid on the stragglers. God's oath is that this pattern has an expiration date built into three successive ages.
The takeaway: evil has a shelf life. The oath has already been sworn. What remains is to live on the right side of it.