To harden one's heart
Behaved with stubbornness. Closed off his heart. Became obstinate or cruel.
("And this hardened his heart in the daughter of our father in heaven, which was a witness between him and the wife of his youth. Judgment and judgment are upon him, to deal with her as with the daughters of Israel" - Sefer Or Zerua 33, Piskei Baba Kama Simaan Poh, and so on: "And his heart was hardened like the heart of stone, and he brought out all the possessions of Rabbi Moshe the Remembrant, and his sons, young and old, by the hand of Rama" - Shu't Maharit Halek B - Hoshen Mishpat Sima'n Magg, and that: "It is not that you are not filled with compassion for her, but that you are grieved over her who brings you to the hands of the hardness of heart" - Agnon/ Orech Natah Lalon, 173)
Translation
Expression (Hebrew)
הִקְשִׁיחַ אֶת לִבּוֹ
Definition (Hebrew)
נָהַג בִּקְשִׁיחוּת. אָטַם אֶת לִבּוֹ. הִתְעַקֵּשׁ אוֹ הִתְאַכְזֵר.
("וְזֶה הִקְשִׁיחַ לִבּוֹ בָּבַת אָבִינוּ שֶׁבַּשָּׁמַיִם אֲשֶׁר הֵעִיד בֵּינוֹ וּבֵין אִשְׁתּוֹ נְעוּרָיו. מִשְׁפָּט וְדִין עָלָיו לִנְהֹג בָּהּ כְּמִשְׁפַּט בְּנוֹת יִשְׂרָאֵל"- סֵפֶר אוֹר זָרוּעַ ח"ג פִּסְקֵי בָּבָא קַמָּא סִימָן פֹּה, וְכוּ:"וְהִקְשִׁיחַ לִבּוֹ לֵב הָאֶבֶן וְהוֹצִיא כָּל נִכְסֵי ה"ר מֹשֶׁה הַנִּזְכָּר וְאֶת בָּנָיו טַף וְנָשִׁים בְּיָד רָמָה"- שׁוּ"ת מהרי"ט חֵלֶק בְּ - חֹשֶׁן מִשְׁפָּט סִימָן מג, וְכֵן:"לֹא דַּי שֶׁאֵין אַתָּה מִתְמַלֵּא רַחֲמִים עָלֶיהָ, אֶלָּא שֶׁאַתָּה מְתַרְעֵם עָלֶיהָ שֶׁמְּבִיאָתְךָ לִידֵי הַקְשָׁחַת הַלֵּב"- עַגְנוֹן/ אוֹרֵחַ נָטָה לָלוּן, 173)