King James Version (KJV)
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.
Modern English
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.
Hebrew
וַיָּבֹ֤א בֵית־אָבִיו֙ עָפְרָ֔תָה וַֽיַּהֲרֹ֞ג אֶת־אֶחָ֧יו בְּנֵֽי־יְרֻבַּ֛עַל שִׁבְּעִ֥ים אִ֖ישׁ עַל־אֶ֣בֶן אֶחָ֑ת וַיִּוָּתֵ֞ר יוֹתָ֧ם בֶּן־יְרֻבַּ֛עַל הַקָּטֹ֖ן כִּ֥י נֶחְבָּֽא׃
vayaboʾ beyt-ʾabiyv ʿapratah vayaharog ʾet-ʾeḥayv bney-yrubaʿal shibʿiym ʾiysh ʿal-ʾeben ʾeḥat vayivater yvotam ben-yrubaʿal haqaṭon kiy neḥbaʾ