NET

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.

Darby

5 And he came to his father's house, to Ophrah, and slew his brethren the sons of Jerubbaal, seventy persons upon one stone; but there remained Jotham the youngest son of Jerubbaal; for he had hid himself.

KJV

5 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.