וַיָּבֹ֤א בֵית־אָבִיו֙ עָפְרָ֔תָה וַֽיַּהֲרֹ֞ג אֶת־אֶחָ֧יו בְּנֵֽי־יְרֻבַּ֛עַל שִׁבְּעִ֥ים אִ֖ישׁ עַל־אֶ֣בֶן אֶחָ֑ת וַיִּוָּתֵ֞ר יוֹתָ֧ם בֶּן־יְרֻבַּ֛עַל הַקָּטֹ֖ן כִּ֥י נֶחְבָּֽא׃ (ס)
Lalu ia pergi ke rumah ayahnya di Ofra dan membunuh saudara-saudaranya, anak-anak Yerubaal, tujuh puluh orang, di atas satu batu. Tetapi Yotam, anak bungsu Yerubaal, tersisa karena ia bersembunyi.
Rashi
They did not act benevolently. They murdered his children, as stated in the narrative.6Ch. 9.