John Gill Commentary Deuteronomy 1:17

"Ye shall not respect persons in judgment; ye shall hear the small and the great alike; ye shall not be afraid of the face of man; for the judgment is God`s: and the cause that is too hard for you ye shall bring unto me, and I will hear it." — Deuteronomy 1:17 (ASV)

You shall not respect persons in judgment
Or pass judgment, and give sentence according to the outward appearances, circumstances, and relations of men; as whether they be friends or foes, rich or poor, old or young, men or women, learned or unlearned; truth and justice should always take place, without any regard to what persons are:

but you shall hear the small as well as the great ;
persons in low, life, and in mean circumstances, as well as great and noble personages; or little causes and of no great moment, as well as those of the utmost importance; all must be attended to, a cause about a "prutah" or a farthing, as well as one about a hundred pounds, in which Jarchi instances, and if that came first it was not to be postponed:

you shall not be afraid of the face of man ;
of the frowns and threatenings of rich men, and of such as are in power and authority; not be awed or intimidated by them from doing justice; see (Job 31:34) ,

for the judgment [is] God's ;
judges stand in the place of God, are put into their office by him, and act under him, and for him, and are accountable to him; and therefore should be careful what judgment they make, or sentence they pass, lest they bring discredit to him, and destruction on themselves:

and the cause that is too hard for you, bring it unto me, and I will
hear it ;
which is said for their encouragement, as well as was an instruction to them not to undertake a cause too difficult for them; see (Exodus 18:22Exodus 18:26) .