הִדֵּר בַּמִּצְוָה (הִדּוּר מִצְוָה)

ביטוי (אנגלית)

To be scrupulous in religious observances (strict fulfillment of a precept)/doing a religious act in the handsomest way

הגדרה (אנגלית)

Do the mitzvah diligently. Invest effort or resources in performing the mitzvah (do not hear praise or boast).

("But Rabbi Zeira said: In the fulness of a mitzvah - up to a third of a mitzvah" - Babba Kama 9b)