Disagree with him/ to differ in opinion/ disagree with
He went against his knowledge. He expressed an opinion that was contrary to his.
("Anyone who dissents from the kingdom of David deserves to be bitten by a snake" - Sanhedrin 110a; and likewise: "Was the whiskey itself made without business, or is it not business, that you dispute it" - Agnon / Ad Henah, 120)
Translation
Expression (Hebrew)
חָלַק עָלָיו
Definition (Hebrew)
הִתְנַגֵּד לְדַעְתּוֹ. הִבִּיעַ דֵּעָה הַמְּנֻוגֶּדֶת לוֹ .
("כָּל הַחוֹלֵק עַל מַלְכוּת דָּוִד רָאוּי לְהַכִּישׁוֹ נָחָשׁ"- סַנְהֶדְרִין קִי ע"א, וְכֵן:"וְכִי היי"ש עַצְמוֹ נַעֲשָׂה בְּלֹא עֵסֶק אוֹ אֵינוֹ עֵסֶק, שֶׁאַתָּה חוֹלֵק עָלָיו"- עַגְנוֹן/ עַד הֵנָּה, 120)