Parashas Devarim
Devarim 1:17
Chabad.org — 1:17
Torah Temimah points to R’ Yehudah / R’ Elazar — Sanhedrin 7b (verified).
לא תכירו — לא תכירהו / לא תנכרהו.
English: Do not respect persons — neither favor nor alienate.
Custom
No favoritism or hostility.