Midrash su Genesi 26:35

And there stood Samuel before the Holy One, blessed be He, and he said: Sovereign of all the Universe ! Do not forget the sin which Esau did to his father, || for he took strange women (for his wives), who offered sacrifices and burnt incense to idols, to embitter the years of the life of his parents. Remember his sin unto his sons and unto his grandsons unto the end of all generations, as it is said, "Let the iniquity of his fathers be remembered with the Lord" (Ps. 109:14). Samuel heard the voice of Agag muttering with his mouth, saying: Perhaps the bitterness of the evil death has passed from me, as it is said, "And Agag said, Surely the bitterness of death is past" (1 Sam. 15:32). Samuel said to him: Just as the sword of Amalek thy ancestor consumed the young men of Israel who were outside the cloud, so that their women dwelt (as) childless women and widows, so by the prayer of the women all the sons of Amalek shall be slain, and their women shall dwell (as) childless women and widows. And by the prayer of Esther and her maidens all the sons of Amalek were slain and their women remained childless and widowed, as it is said, "And Samuel said, As thy sword hath made women childless, so shall thy mother be childless among women" (1 Sam. 15:33).