He went to his father’s house in Ophrah and killed his 70 brothers, the sons of Jerubbaal, on top of a large stone. But Jotham, the youngest son of Jerubbaal, survived, because he hid himself.

and now you have attacked my father’s house today, killed his 70 sons on top of a large stone, and made Abimelech, the son of his slave, king over the lords of Shechem ‘because he is your brother’—