לֹא־תֹאבֶ֣ה ל֔וֹ וְלֹ֥א תִשְׁמַ֖ע אֵלָ֑יו וְלֹא־תָח֤וֹס עֵֽינְךָ֙ עָלָ֔יו וְלֹֽא־תַחְמֹ֥ל וְלֹֽא־תְכַסֶּ֖ה עָלָֽיו׃
não cederás a ele, nem lhe darás ouvidos; nem poupará teu olhar sobre ele, nem terás compaixão, nem o esconderás;
Makkot
But I'd this logical?! Whether [one holds like] the opinion that it is a mitzvah [for the Goel HaDam to kill the murderer] or whether [one holds like] the opinion that it is permissible, is it permitted [for a son to kill his father]? But Rabba bar Rav Huna said, and so too was taught in a baraisa of the academy of Rebbi Yishmael, For everything a son may not be made into an agent [of the court] against his father to hit him or curse him, except in the case of one who instigates [idolatry] upon which the Torah says (Deuteronomy 13,9) "do not spare him and do not conceal him".