Targum su Esodo 17:16

And he said, 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.

And he said, The oath hath come forth from beneath the throne of the Great One, of all the world the Lord; the first king who will sit upon the throne of the kingdom of the sons of Israel, Shaul, the son of Kish, will set the battle in array against the house of Amalek, and will slay them; and those of them that remain will Mardekai and Esther destroy. The Lord hath said by His Word that the memory of Amalek shall perish to the age of ages.