Judges 9:5

9:5 He went to his father’s home in Ophrah and murdered his half-brothers, the seventy legitimate sons of Jerub-Baal, on one stone. Only Jotham, Jerub-Baal’s youngest son, escaped, because he hid.

Judges 9:56

9:56 God repaid Abimelech for the evil he did to his father by murdering his seventy half-brothers.