First Impression Bias (from Thomas Gelmi https://www.huffingtonpost.com/thomas-gelmi/first-impression-bias-how_b_5703613.html)
If the first encounter with a new colleague, team member or customer doesn’t go so well, chances are that we fall into a trap: our first impression affects the image we have of people or situations and with that, the future expectations we have of them. This can become a pitfall.
Judges and First Impressions
(א) לֹ֥א תִשָּׂ֖א שֵׁ֣מַע שָׁ֑וְא אַל־תָּ֤שֶׁת יָֽדְךָ֙ עִם־רָשָׁ֔ע לִהְיֹ֖ת עֵ֥ד חָמָֽס׃ (ס)
(א) הזהיר השופט שלא לשמוע אחד מבעלי הדין שלא בפני בעל דינו. והוא אמרו לא תשא שמע שוא, שברוב יהיו בעלי דין שלא בפני בעל דינם והזהיר השופט משמוע אותם הדברים, כדי שלא תכנס לנפשו צורת הדברים אין יושר להם ולא אמתות.
היכי דמי רשע ערום אמר רבי יוחנן זה המטעים דבריו לדיין קודם שיבא בעל דין חברו
The Gemara asks: Who is considered a conniving wicked person? Rabbi Yoḥanan says: This is one who presents his statement to the judge before the other litigant comes and thereby prejudices the judge in his favor.
Apropos the appointment of judges, the Gemara relates that they sent the following statement from there, i.e., Eretz Yisrael: Who is the one destined to receive a place in the World-to-Come? It is one who is modest and humble, who bows and enters and bows and exits
Individual Bias
Individual Bias even when you have nothing to Lose
Bias, even when you don't even want that bias to exist
(א) ויחד יתרו. וַיִּשְׂמַח יִתְרוֹ, זֶהוּ פְּשׁוּטוֹ. וּמִ"אַ נַעֲשָׂה בְשָׂרוֹ חִדּוּדִין חִדּוּדִין, מֵיצֵר עַל אִבּוּד מִצְרָיִם, הַינוּ דְּאָמְרֵי אִנְשֵׁי "גִּיּוֹרָא עַד עֲשָׂרָה דָּרֵי לָא תְבַזֵּי אֲרַמָּאָה בְּאַפֵּיהּ":
(1) ויחד יתרו AND JETHRO REJOICED — This is its literal meaning. A Midrashic comment is: his flesh became full of prickles (חדודין — his flesh crept with horror) — he felt grieved at the destruction of Egypt. That is what people say (what the common proverb says): A proselyte even though his heathen descent dates from as far back as the tenth generation, do not speak slightingly of an Aramean (any non-Jew) in his presence (Sanhedrin 94a)
Stubbornness
(ד) באבירם בכרו יסדה. כשיסדה, מת בנו בכורו, וקבר והלך וקבר כל בניו, עד שמת האחרון בהצבת דלתות, וכן הוא קללות של יהושע (שם):
(26) At that time Joshua pronounced this oath: “Cursed of the LORD be the man who shall undertake to fortify this city of Jericho: he shall lay its foundations at the cost of his first-born, and set up its gates at the cost of his youngest.”
What should happen when we recognise this bias: