'Stone' in the Bible

He went to his father's house at Ophrah, and killed his brothers the sons of Jerubbaal, being seventy persons, on one stone: but Jotham the youngest son of Jerubbaal was left; for he hid himself.

and you have risen up against my father's house this day, and have slain his sons, seventy persons, on one stone, and have made Abimelech, the son of his female servant, king over the men of Shechem, because he is your brother);