וְשָׁפַ֤ט בְּצֶ֙דֶק֙ דַּלִּ֔ים וְהוֹכִ֥יחַ בְּמִישׁ֖וֹר לְעַנְוֵי־אָ֑רֶץ וְהִֽכָּה־אֶ֙רֶץ֙ בְּשֵׁ֣בֶט פִּ֔יו וּבְר֥וּחַ שְׂפָתָ֖יו יָמִ֥ית רָשָֽׁע׃
Ibn Ezra on Isaiah
And he will judge the poor with justice. According to the rule, Neither shalt thou countenance the poor in his cause (Exod. 33:3).
Rashi on Isaiah
and he shall smite the earth with the rod of his mouth As the Targum states: And he shall smite the sinful of the earth.