And he went unto his father's house at Ophrah, and slew his brethren the sons of Jerubbaal, [being] threescore and ten persons, upon one stone: notwithstanding yet Jotham the youngest son of Jerubbaal was left; for he hid himself. (9:5)

And ye are risen up against my father's house this day, and have slain his sons, threescore and ten persons, upon one stone, and have made Abimelech, the son of his maidservant, king over the men of Shechem, because he [is] your brother;) (9:18)

Thus God rendered the wickedness of Abimelech, which he did unto his father, in slaying his seventy brethren: (9:56)