הִקְשָׁה אֶת לִיבּוֹ (הִקְשָׁה אֶת לִיבּוֹ שֶׁל...)

ביטוי (אנגלית)

To harden one's own heart/ (to harden someone's heart/ make him stubborn)

הגדרה (אנגלית)

He revealed hardness and tightness. He became cruel.

("Blessed is the man who fears continually, but he who hardens his heart will fall into evil" - Proverbs of the Strength of Hand)