וַיְהִ֤י יְהוָה֙ אֶתּ־יְהוּדָ֔ה וַיֹּ֖רֶשׁ אֶת־הָהָ֑ר כִּ֣י לֹ֤א לְהוֹרִישׁ֙ אֶת־יֹשְׁבֵ֣י הָעֵ֔מֶק כִּי־רֶ֥כֶב בַּרְזֶ֖ל לָהֶֽם׃
Kasama ng Juda ang Walang-Hanggan, at pinalayas niya ang mga taga-kabundukan; ngunit hindi niya kayang palayasin ang mga naninirahan sa lambak, sapagkat may mga karwaheng bakal sila.
Rashi
However, he could not oust. [Targum] Yonasan interprets: Afterward, as they had sinned, they could not oust the valley dwellers.