Negative commandment · Lo Ta’aseh #276 of 613
For a judge not to fear rendering [a just] judgment because of a wicked man
שלא יירא הדיין בדין מאדם רע
The verse · Devarim 1:17
לֹא־תַכִּירוּ פָנִים בַּמִּשְׁפָּט כַּקָּטֹן כַּגָּדֹל תִּשְׁמָעוּן לֹא תָגוּרוּ מִפְּנֵי־אִישׁ כִּי הַמִּשְׁפָּט לֵאלֹהִים הוּא וְהַדָּבָר אֲשֶׁר יִקְשֶׁה מִכֶּם תַּקְרִבוּן אֵלַי וּשְׁמַעְתִּיו
“Do not respect persons in judgment; but hear the small as well as the great; do not be afraid of the face of any man; for the judgment is God’s: and the cause that is too hard for you, bring it to me, and I will hear it.”
The Rambam’s words
For a judge not to fear rendering [a just] judgment because of a wicked man, as [Deuteronomy 1:17] states: "Do not fear anyone."
שלא יירא הדיין בדין מאדם רע, שנאמר "לֹא תָגוּרוּ מִפְּנֵי אִישׁ" (דברים א, יז).
Who & when
“And this commandment is practiced in every place and at all times by males, as judgment is theirs.”
Where in the Mishneh Torah
Hilchot The Sanhedrin and the Penalties within Their Jurisdiction הלכות סנהדרין והעונשין המסורין להם