This enemy of Israel bore the name Amalek to denote the rapidity with which he moved against Israel, for like a swarm of locusts he flew upon them; and the name furthermore designates the purpose of this enemy, who came to suck the blood of Israel. This Amalek was a son of Eliphaz, the first-born son of Esau, and although the descendants of Jacob had been weaker and more insignificant in earlier times, Amalek had left them in peace, for he had excellent reasons to delay his attack.
God had revealed to Abraham that his seed would have to serve in the land of the Egyptians, and had put the payment of this debt upon Isaac, and after his death, upon Jacob and his descendants. The wicked Amalek now said to himself, "If I destroy Jacob and his descendants, God will impose the Egyptians bondage upon, me, grandson of Esau, descendant of Abraham." Therefore he kept himself in restraint as long as Israel dwelt in Egypt, but only after the bondage predicted to the seed of Abraham had been served in full, did he set out to accomplish the war of annihilation against Israel, which his grandfather Esau had enjoined upon him.