וַיָּ֣שֶׁב אֱלֹהִ֔ים אֵ֖ת רָעַ֣ת אֲבִימֶ֑לֶךְ אֲשֶׁ֤ר עָשָׂה֙ לְאָבִ֔יו לַהֲרֹ֖ג אֶת־שִׁבְעִ֥ים אֶחָֽיו׃
Thus God requited the wickedness of Abimelech, which he did unto his father, in slaying his seventy brethren;
Read halakhic rulings (Jewish law) on Judges 9:56: and classical halakhic sources.