Deuteronomy 1:16

And I charged your judges at that time
When they were appointed and constituted, even the heads and rulers before spoken of; this charge is also new, and not recorded before:

saying, hear the causes between your brethren;
hear both sides, and all that each of them have to say; not suffer one to say all he has to say, and oblige the other to cut his words short, as the Targum of Jonathan paraphrases it; but give them leave and time to tell their case, and give the best evidence they can of it:

and judge righteously;
impartially, just as the case really appears to be, and according to the evidence given:

between every man and his brother;
between an Israelite and an Israelite:

and the stranger that is with him;
between an Israelite and proselyte, whether a proselyte of the gate, or of righteousness; the same justice was to be done to them as to an Israelite.